gitserver: Remove and deprecate no_timeout option from exec

[eseliger]

Commands without any timeout are risky, and we just removed the last user of it, so we drop it now.

Test plan:

Removed an unused flag, tests are still passing.

[eseliger]

• gitserver: Deprecate Exec and remove localGit #62773 : 3 dependent PRs (#62774 , #62801 , #62825 )
• gitserver: Remove and deprecate no_timeout option from exec #62743 👈
• rockskip: Replace second long-running process with gRPC API #62734
• gitserver: Add CommitLog API to replace client-side Commits #62606
• gitserver: Fix duration reported for ChangedFiles #62603
• gitserver: Make ReadDir return an iterator on client side #62602
• gitserver: Move implementation of HasCommitAfter to caller #62520
• gitserver: Always use Commits in HasCommitAfter #62519
• gitserver: Implement CommitLog using Commits #62518
• gitserver: Move CommitsUniqueToBranch to callsite #62514
• gitserver: Implement CommitsUniqueToBranch using Commits #62513
• gitserver: Implement Stat and ReadDir in gRPC API #62107
• main

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[eseliger]

Merge activity

• May 21, 11:56 AM EDT: Graphite rebased this pull request as part of a merge.
• May 21, 12:05 PM EDT: @eseliger merged this pull request with Graphite.