stream-clone-test: simplify the background file closing test

Here we just care about the fact the background file closing logic actually ran. We don't need to check the details of the cloning.

The details of the output is very fragile and consume a lot of time for little
value when adjusting formats, caches, and protocol. So we filter it out.

tests/test-clone-stream.t

@@ -266,95 +266,15 b' The alias flag should trigger a stream c'
   no changes found (stream-legacy !)
 
 Clone with background file closing enabled
+-------------------------------------------
 
-#if stream-legacy
-  $ hg --debug --config worker.backgroundclose=true --config worker.backgroundcloseminfilecount=1 clone --stream -U http://localhost:$HGPORT clone-background | grep -v adding
-  using http://localhost:$HGPORT/
-  sending capabilities command
-  sending branchmap command
-  streaming all changes
-  sending stream_out command
-  1091 files to transfer, 102 KB of data (no-zstd !)
-  1091 files to transfer, 98.8 KB of data (zstd !)
-  starting 4 threads for background file closing
-  updating the branch cache
-  transferred 102 KB in * seconds (* */sec) (glob) (no-zstd !)
-  transferred 98.8 KB in * seconds (* */sec) (glob) (zstd !)
-  query 1; heads
-  sending batch command
-  searching for changes
-  all remote heads known locally
-  no changes found
-  sending getbundle command
-  bundle2-input-bundle: with-transaction
-  bundle2-input-part: "listkeys" (params: 1 mandatory) supported
-  bundle2-input-part: "phase-heads" supported
-  bundle2-input-part: total payload size 24
-  bundle2-input-bundle: 2 parts total
-  checking for updated bookmarks
-  updating the branch cache
-  (sent 5 HTTP requests and * bytes; received * bytes in responses) (glob)
-#endif
-#if stream-bundle2-v2
-  $ hg --debug --config worker.backgroundclose=true --config worker.backgroundcloseminfilecount=1 clone --stream -U http://localhost:$HGPORT clone-background | grep -v adding
-  using http://localhost:$HGPORT/
-  sending capabilities command
-  query 1; heads
-  sending batch command
-  streaming all changes
-  sending getbundle command
-  bundle2-input-bundle: with-transaction
-  bundle2-input-part: "stream2" (params: 3 mandatory) supported
-  applying stream bundle
-  1094 files to transfer, 102 KB of data (no-zstd !)
-  1094 files to transfer, 98.9 KB of data (zstd no-rust !)
-  1096 files to transfer, 99.0 KB of data (zstd rust !)
-  starting 4 threads for background file closing
+The backgound file closing logic should trigger when configured to do so, and
+the result should be a valid repository.
+
+  $ hg --debug --config worker.backgroundclose=true --config worker.backgroundcloseminfilecount=1 clone --stream -U http://localhost:$HGPORT clone-background | grep "background file closing"
   starting 4 threads for background file closing
-  updating the branch cache
-  transferred 102 KB in * seconds (* */sec) (glob) (no-zstd !)
-  bundle2-input-part: total payload size 119001 (no-zstd !)
-  transferred 98.9 KB in * seconds (* */sec) (glob) (zstd no-rust !)
-  transferred 99.0 KB in * seconds (* */sec) (glob) (zstd rust !)
-  bundle2-input-part: total payload size 116162 (zstd no-bigendian no-rust !)
-  bundle2-input-part: total payload size 116330 (zstd no-bigendian rust !)
-  bundle2-input-part: total payload size 116157 (zstd bigendian no-rust !)
-  bundle2-input-part: total payload size 116325 (zstd bigendian rust !)
-  bundle2-input-part: "listkeys" (params: 1 mandatory) supported
-  bundle2-input-bundle: 2 parts total
-  checking for updated bookmarks
-  updating the branch cache
-  (sent 3 HTTP requests and * bytes; received * bytes in responses) (glob)
-#endif
-#if stream-bundle2-v3
-  $ hg --debug --config worker.backgroundclose=true --config worker.backgroundcloseminfilecount=1 clone --stream -U http://localhost:$HGPORT clone-background | grep -v adding
-  using http://localhost:$HGPORT/
-  sending capabilities command
-  query 1; heads
-  sending batch command
-  streaming all changes
-  sending getbundle command
-  bundle2-input-bundle: with-transaction
-  bundle2-input-part: "stream3-exp" (params: 1 mandatory) supported
-  applying stream bundle
-  1093 entries to transfer
-  starting 4 threads for background file closing
-  starting 4 threads for background file closing
-  updating the branch cache
-  transferred 102 KB in * seconds (* */sec) (glob) (no-zstd !)
-  bundle2-input-part: total payload size 120096 (no-zstd !)
-  transferred 98.9 KB in * seconds (* */sec) (glob) (zstd no-rust !)
-  transferred 99.0 KB in * seconds (* */sec) (glob) (zstd rust !)
-  bundle2-input-part: total payload size 117257 (zstd no-rust no-bigendian !)
-  bundle2-input-part: total payload size 117425 (zstd rust no-bigendian !)
-  bundle2-input-part: total payload size 117252 (zstd bigendian no-rust !)
-  bundle2-input-part: total payload size 117420 (zstd bigendian rust !)
-  bundle2-input-part: "listkeys" (params: 1 mandatory) supported
-  bundle2-input-bundle: 2 parts total
-  checking for updated bookmarks
-  updating the branch cache
-  (sent 3 HTTP requests and * bytes; received * bytes in responses) (glob)
-#endif
+  starting 4 threads for background file closing (no-stream-legacy !)
+  $ hg verify -R clone-background --quiet
 
 Cannot stream clone when there are secret changesets