test(git): exercise multi git revision lockfile

[weihanglo]

What does this PR try to resolve?

Testes extracted from #17275.

How to test and review this PR?

CI passes.

We adds tests instead of merging the fix because

• We are not satisfied with the solution presented in fix(git): download each locked rev from its own checkout #17275. It adds more obscure interactions. The ideal solution should fix the "root cause" — SourceId identity issue.
• For the network issue (lockfile_with_multiple_revisions_bump_pkg_version), people can cargo update to make revision aligned (which is usually what people want)
• For the bug that silently compiling to wrong revision (the other two tests), that is bad and harder to detect. However, cargo update should fix and we could probably have a lint to ensure a single rev in a dependency graph. See git dependency revs do not affect crate resolution as I might expect #6921.

[rustbot]

r? @epage

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Why was this reviewer chosen?

The reviewer was selected based on:

• Owners of files modified in this PR: @epage, @weihanglo
• @epage, @weihanglo expanded to epage, weihanglo

[weihanglo]

thread 'ssh::known_host_without_port' (114995) panicked at tests/testsuite/ssh.rs:281:10:

test failed running `/home/runner/work/cargo/cargo/target/debug/cargo fetch`
error: process exited with code 101 (expected 0)
--- stdout

--- stderr
    Updating git repository `ssh://testuser@127.0.0.1:32774/repos/bar.git`
error: failed to get `bar` as a dependency of package `foo v0.1.0 (/home/runner/work/cargo/cargo/target/tmp/cit/testsuite/ssh/known_host_without_port/foo)`

Caused by:
  failed to load source for dependency `bar`

Caused by:
  unable to update ssh://testuser@127.0.0.1:32774/repos/bar.git

Caused by:
  failed to clone into: /home/runner/work/cargo/cargo/target/tmp/cit/testsuite/ssh/known_host_without_port/home/.cargo/git/db/bar-0d8be32352437f8f

Caused by:
  network failure seems to have happened
  if a proxy or similar is necessary `net.git-fetch-with-cli` may help here
  https://doc.rust-lang.org/cargo/reference/config.html#netgit-fetch-with-cli

Caused by:
  failed to start SSH session: Failed getting banner; class=Ssh (23)

intermittent GitHub network issue. Re-queuing.