Re-Introduce Implicit Conversion as Warnings

[Andrewyx]

Description of the task

Post Bazel 8 migration, we had to disable the escalation of warnings in #3459. The issue with the flag was related to the application of the warning on ALL subsequent deps and in particular external deps (see .bazelrc). This is bad because we do not control external repos.

# build --per_file_copt=software/.*,shared/.*,-external/.*@-Wconversion

Thus, the task in this PR is to re-introduce this feature so that we can ensure code quality and prevent accidental implicit casting from occurring within our own code.

Acceptance criteria

• [ ] We check for implicit casting in our code base and not within external repos.

Blocked By