✨ Fixes and Improvements for TokenGetter

[skattoju]

Description

Fixes for some issues that were over looked in #1006 including:

• Fixed unintentional integer division when rotating tokens
• Fixed populating TokenRequest.Spec with nanoseconds instead of seconds
• Removing the parameter that controls the duration after which expired tokens should be deleted and instead deleting them as soon as they are encountered

Reviewer Checklist

• [ ] API Go Documentation
• [ ] Tests: Unit Tests (and E2E Tests, if appropriate)
• [ ] Comprehensive Commit Messages
• [ ] Links to related GitHub Issue(s)

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 78.00%. Comparing base (5c83e91) to head (019603d).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1014 +/- ## ========================================== - Coverage 78.07% 78.00% -0.08% ========================================== Files 18 18 Lines 1254 1250 -4 ========================================== - Hits 979 975 -4 Misses 193 193 Partials 82 82 ``` | [Flag](https://app.codecov.io/gh/operator-framework/operator-controller/pull/1014/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=operator-framework) | Coverage Δ | | |---|---|---| | [e2e](https://app.codecov.io/gh/operator-framework/operator-controller/pull/1014/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=operator-framework) | `56.54% <ø> (ø)` | | | [unit](https://app.codecov.io/gh/operator-framework/operator-controller/pull/1014/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=operator-framework) | `53.60% <100.00%> (-0.15%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=operator-framework#carryforward-flags-in-the-pull-request-comment) to find out more.

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