SNOW-642635: Remove legacy ocsp cache code

[sfc-gh-aling]

Please answer these questions before submitting your pull requests. Thanks!

1. What GitHub issue is this PR addressing? Make sure that there is an accompanying issue to your PR.

   Fixes #SNOW-642635

2. Fill out the following pre-review checklist:

   • I am adding a new automated test(s) to verify correctness of my new code
   • I am adding new logging messages
   • I am adding a new telemetry message
   • I am modifying authorization mechanisms
   • I am adding new credentials
   • I am modifying OCSP code
   • I am adding a new dependency

3. Please describe how your code solves the related issue.

• Remove SSD code which is never used
• Refactor the OCSP_CACHE, consolidating the old design with the new design:
  • one in-memory cache: OCSP_RESPONSE_VALIDATION_CACHE, which caches not only ocsp response, but also the validation result
  • two files: OCSP_RESPONSE_VALIDATION_CACHE which is the dump of the in-memory one, and OCSP_RESPONSE which stores the raw ocsp responses in the same format as downloaded from the snowflake cache service.

[codecov-commenter]

Codecov Report

Merging #1292 (3a94c4a) into main (89a54fc) will increase coverage by 0.57%.
The diff coverage is 84.05%.

@@            Coverage Diff             @@
##             main    #1292      +/-   ##
==========================================
+ Coverage   81.49%   82.07%   +0.57%     
==========================================
  Files          59       59              
  Lines        8562     8386     -176     
  Branches     1275     1240      -35     
==========================================
- Hits         6978     6883      -95     
+ Misses       1277     1196      -81     
  Partials      307      307              

Impacted Files	Coverage Δ
src/snowflake/connector/cache.py	88.96% <80.00%> (+1.37%)	⬆️
src/snowflake/connector/ocsp_snowflake.py	76.95% <84.21%> (+5.29%)	⬆️
src/snowflake/connector/ocsp_asn1crypto.py	75.34% <100.00%> (-0.66%)	⬇️
src/snowflake/connector/ssd_internal_keys.py	0.00% <0.00%> (-82.36%)	⬇️
src/snowflake/connector/util_text.py	96.29% <0.00%> (+0.14%)	⬆️
src/snowflake/connector/errors.py	90.32% <0.00%> (+0.53%)	⬆️
src/snowflake/connector/pandas_tools.py	83.33% <0.00%> (+1.03%)	⬆️

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[sfc-gh-mkeller]

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