refactor tests to fix ubsan suppressions

[maflcko]

The ubsan suppressions for test files have several issues:

• They bloat the suppressions file, distracting from real bugs
• They are file-wide, thus suppressing any other (newly introduced) issues in the same file
• Some of them are causing compile issues with -Wimplicit-int-conversion

Fix all issues by making the integer truncations or sign changes explicit.

This is a refactor that shouldn't change the test binary unless compiled with sanitizers.

[maflcko]

Rebased for fresh CI

[DrahtBot]

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Conflicts

Reviewers, this pull request conflicts with the following ones:

• #23962 (Use int64_t type for transaction sizes consistently by hebasto)

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.

[jonatack]

Code review ACK fa9bab0

[maflcko]

Apologies, but I decided to force push to replace unsigned(~0x00800000) with ~0x00800000U to avoid a c-style cast where it is not needed. no other changes other than rebase

[jonatack]

ACK faedb11 per git range-diff 1824644a fa9bab0 faedb11 and clang 13 debug build sanity check