fuzz: Add missing calls to SetMockTime for determinism #32927

1. 
   maflcko commented at 12:49 pm on July 9, 2025: member

   (Tracking issue #29018)

   During fuzzing, AppInitParameterInteraction may actually disable a previously set mocktime. This is confusing and can also cause non-determinism.

   Fix this issue, by

   • fixing the erroneous -mocktime parsing in AppInitParameterInteraction.
   • adding the missing SetMockTime calls to the affected fuzz init functions.
   • adding a CheckGlobals to the fuzz init, to prevent this issue in the future.

   This can be tested by

   • Cherry-picking the CheckGlobals-commit onto current master and observing a fuzz failure in the touched fuzz targets.
   • Reverting the touched fuzz fixups and observing a fuzz failure for each target.
2. Add SetMockTime for time_point types fa6b45fa8e
3. test: Avoid resetting mocktime in testing setup

   This allows to set the mocktime before the testing setup.
   
   Also, in some fuzz tests the mocktime was reset to 0 before this change,
   so set it.

   fa26bfde98
4. fuzz: CheckGlobals in init fa8862723c
5. DrahtBot added the label Tests on Jul 9, 2025
6. 
   DrahtBot commented at 12:49 pm on July 9, 2025: contributor

   The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

   Code Coverage & Benchmarks

   For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/32927.

   Reviews

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   Type	Reviewers
   ACK	w0xlt

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   Conflicts

   Reviewers, this pull request conflicts with the following ones:

   • #32822 (fuzz: Make process_message(s) more deterministic by maflcko)
   • #32430 (test: Add and use ElapseTime helper by maflcko)

   If you consider this pull request important, please also help to review the conflicting pull requests. Ideally, start with the one that should be merged first.

7. fanquake requested review from dergoegge on Jul 10, 2025
8. fanquake requested review from marcofleon on Jul 10, 2025
9. 
   w0xlt commented at 8:45 pm on July 10, 2025: contributor

   ACK https://github.com/bitcoin/bitcoin/pull/32927/commits/fa8862723c14cdd471bbffc7a4897ece2e6d8a7f

Contributors
maflcko DrahtBot w0xlt

Review Requested
dergoegge marcofleon

Labels
Tests