General Deprecation Warning Improvements

[QMalcolm]

Resolves #11429

Problem

• Instances of deprecation warnings could only be show once on invocation
  • This made fixing deprecation warnings slow / annoying
• It was unknown how many violations of a given deprecation type were in any run
  • Meant fixing deprecation warnings takes an unknown amount of time
    • i.e. you just keep running dbt run fixing one warning, and running again until its clean 🙃

Solution

• Keep track of how many times a deprecation type is encountered
• Still only show the first instance of a deprecation type unless --show-all-deprecations is specified
• Show summaries for deprecation warnings with defined summary types at the end of any command (via postflight)

Checklist

• I have read the contributing guide and understand what's expected of me.
• I have run this code in development, and it appears to resolve the stated issue.
• This PR includes tests, or tests are not required or relevant for this PR.
• This PR has no interface changes (e.g., macros, CLI, logs, JSON artifacts, config files, adapter interface, etc.) or this PR has already received feedback and approval from Product or DX.
• This PR includes type annotations for new and modified functions.

[github-actions]

Thank you for your pull request! We could not find a changelog entry for this change. For details on how to document a change, see the contributing guide.

[QMalcolm]

Closing in favor of #11466

[codecov]

Codecov Report

Attention: Patch coverage is 47.91667% with 25 lines in your changes missing coverage. Please review.

Project coverage is 87.36%. Comparing base (4aa5169) to head (d7c2e83).
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11465      +/-   ##
==========================================
- Coverage   88.90%   87.36%   -1.54%     
==========================================
  Files         191      194       +3     
  Lines       24397    24550     +153     
==========================================
- Hits        21690    21448     -242     
- Misses       2707     3102     +395     

Flag	Coverage Δ
integration	83.92% <43.75%> (-2.04%)	⬇️
unit	62.70% <41.66%> (-0.13%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
Unit Tests	62.70% <41.66%> (-0.13%)	⬇️
Integration Tests	83.92% <43.75%> (-2.04%)	⬇️

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.