fix: Exception Handling for Retryable errors

[taherkl]

This pull request introduces enhanced retry logic in DataFlow by incorporating additional exception handling for improved reliability and fault tolerance. The following exceptions are now included under the retry mechanism:

• ConnectionInitException: Handles scenarios where the initial connection to a Cassandra node fails.
• DriverTimeoutException: Retries when the driver times out while awaiting a response, ensuring transient network delays are managed gracefully.
• AllNodesFailedException: Implements retry logic when all nodes fail to respond, which can occur due to temporary network partitions or high load.
• BusyConnectionException: Addresses situations where all connections are busy, enhancing request handling during peak loads.
• NodeUnavailableException: Retries when a specific node is temporarily unavailable, improving availability in distributed environments.
• QueryExecutionException: Previously categorized as a permanent error, this is now moved to the retry logic. This change is made because QueryExecutionException often occurs due to temporary issues like timeouts or resource contention, even when the query is valid.

Key Changes:

• Added Retry Logic: Included the above exceptions in the retry mechanism to enhance fault tolerance and reduce transient failures.
• Updated Error Handling: Moved QueryExecutionException from permanent error classification to retry logic, ensuring valid queries are retried for better consistency.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.06%. Comparing base (7b7081b) to head (8873d7f).
Report is 4 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2196      +/-   ##
============================================
- Coverage     47.06%   47.06%   -0.01%     
+ Complexity     4376     4374       -2     
============================================
  Files           876      876              
  Lines         52218    52218              
  Branches       5505     5505              
============================================
- Hits          24578    24574       -4     
- Misses        25881    25884       +3     
- Partials       1759     1760       +1     

Components	Coverage Δ
spanner-templates	68.93% <100.00%> (-0.01%)	⬇️
spanner-import-export	65.72% <ø> (-0.02%)	⬇️
spanner-live-forward-migration	76.54% <ø> (ø)
spanner-live-reverse-replication	78.80% <100.00%> (ø)
spanner-bulk-migration	87.94% <ø> (ø)

Files with missing lines	Coverage Δ
...leport/v2/templates/transforms/SourceWriterFn.java	85.21% <100.00%> (ø)

... and 2 files with indirect coverage changes