Update negative test to not use --require-cached

Summary:
Removed --require-cached from the negative test case in the integration test.

The test repos are created fresh for each test run and won't be in the CAF cache, so --require-cached would always fail for them. Changed the negative test to simply verify that gclone fails when trying to clone a nonexistent branch, which is more appropriate for the integration test environment.

The --require-cached functionality is still tested in dod.sh with real cached repositories.

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overriding_review_checks_triggers_an_audit_and_retroactive_review
Oncall Short Name: devinfra_imoc

Differential Revision: D103736207

fbshipit-source-id: a3080051656cead89915e71d7d93b81a7012f41d

Author: giorgidze

eden/mononoke/tests/integration/mononoke_git_server/test-mononoke-git-server-with-gclone.t

@@ -188,10 +188,10 @@
 
   $ quiet "$GCLONE" grepo "$MONONOKE_GIT_SERVICE_BASE_URL/manifest.git" IGNORED -b master --require-cached-repo-url --ensure-ttl-duration
 
--- Test --require-cached fails when not cached --
+-- Test gclone git fails with nonexistent branch --
 
   $ cd "$TESTTMP"
-  $ EXPECTED_RC=1 quiet "$GCLONE" git "$MONONOKE_GIT_SERVICE_BASE_URL/repo_a.git" should_fail -b nonexistent-branch --require-cached
+  $ EXPECTED_RC=1 quiet "$GCLONE" git "$MONONOKE_GIT_SERVICE_BASE_URL/repo_a.git" should_fail -b nonexistent-branch
   [1]
 
 -- Test gclone git with --partial-clone=false (upload) --