feat: add check for api removed with deprecation

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 98.11321% with 1 line in your changes missing coverage. Please review.

Project coverage is 86.88%. Comparing base (b46cf83) to head (e96dac9). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
checker/check_api_removed.go	98.03%	0 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #621 +/- ## ========================================== + Coverage 86.85% 86.88% +0.03% ========================================== Files 234 234 Lines 13332 13370 +38 ========================================== + Hits 11579 11617 +38 Misses 1340 1340 Partials 413 413 ``` | [Flag](https://app.codecov.io/gh/Tufin/oasdiff/pull/621/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Tufin) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/Tufin/oasdiff/pull/621/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Tufin) | `86.88% <98.11%> (+0.03%)` | :arrow_up: | 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=Tufin#carryforward-flags-in-the-pull-request-comment) to find out more.

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