[gomod] Deprecate the '--force-gomod-tidy' CLI flag

[eskultety]

This deprecates the --force-gomod-tidy CLI option. Since this effort could result in a controversial breaking behaviour the first attempt is somewhat conservative in that it doesn't default to using go mod tidy at all and instead ignores this aspect of a misconfigured repository.

Relates to: #713

Maintainers will complete the following section

• Commit messages are descriptive enough
• Code coverage from testing does not decrease and new code is covered
• Docs updated (if applicable)
• Docs links in the code are still valid (if docs were updated)

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