feat: make schema operations limit exceeded error retryable

[kprokopenko]

This PR makes the error 'Request exceeded a limit on the number of schema operations, try again later' retryable.

Changes

• Added helper method hasSchemaOperationsLimitExceeded() to check for the specific error message
• Updated Type() method to return TypeRetryable for GENERIC_ERROR with schema operations limit message
• Updated BackoffType() method to return TypeSlow backoff for this error (similar to OVERLOADED errors)
• Added comprehensive tests to verify the retryable behavior

Testing

All existing tests pass, and new tests have been added to verify:

• The error is correctly identified as retryable
• The backoff type is set to slow
• Nested issues are also checked
• Other GENERIC_ERROR messages remain non-retryable

Fixes #1933

[github-actions]

github.com/ydb-platform/ydb-go-sdk/v3/topic/topicoptions

compatible changes

AlterConsumerResetAvailabilityPeriod: added
AlterConsumerWithAvailabilityPeriod: added

github.com/ydb-platform/ydb-go-sdk/v3/topic/topictypes

compatible changes

Consumer.AvailabilityPeriod: added

summary

Inferred base version: v3.118.3
Suggested version: v3.119.0

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.85%. Comparing base (995c4d2) to head (d029953).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1946      +/-   ##
==========================================
+ Coverage   73.84%   73.85%   +0.01%     
==========================================
  Files         392      392              
  Lines       34379    34391      +12     
==========================================
+ Hits        25386    25401      +15     
+ Misses       7862     7859       -3     
  Partials     1131     1131              

Flag	Coverage Δ
experiment	73.52% <100.00%> (-0.01%)	⬇️
go-1.21.x	72.61% <100.00%> (+<0.01%)	⬆️
go-1.25.x	73.84% <100.00%> (+0.02%)	⬆️
integration	54.93% <66.66%> (+0.03%)	⬆️
macOS	47.22% <100.00%> (+0.03%)	⬆️
ubuntu	73.85% <100.00%> (+0.01%)	⬆️
unit	47.22% <100.00%> (+0.03%)	⬆️
windows	47.21% <100.00%> (+0.03%)	⬆️
ydb-24.4	54.12% <66.66%> (+0.01%)	⬆️
ydb-25.2	54.87% <66.66%> (+0.18%)	⬆️
ydb-latest	54.39% <66.66%> (-0.02%)	⬇️
ydb-nightly	73.52% <100.00%> (-0.01%)	⬇️

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