Add KafkaTopic to kafka to gcs template

[AnandInguva]

Use KafkaTopic to get topics and bootstrap server

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 41.22%. Comparing base (f11965f) to head (bfcc3f9).
Report is 8 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1602      +/-   ##
============================================
+ Coverage     40.89%   41.22%   +0.32%     
+ Complexity     3105     2878     -227     
============================================
  Files           744      745       +1     
  Lines         43385    43592     +207     
  Branches       4629     4640      +11     
============================================
+ Hits          17742    17970     +228     
+ Misses        24130    24102      -28     
- Partials       1513     1520       +7     

Components	Coverage Δ
spanner-templates	60.89% <96.77%> (+1.28%)	⬆️
spanner-import-export	64.45% <ø> (ø)
spanner-live-forward-migration	73.64% <ø> (ø)
spanner-live-reverse-replication	48.66% <ø> (ø)
spanner-bulk-migration	81.62% <96.77%> (+3.54%)	⬆️

Files	Coverage Δ
...le/cloud/teleport/v2/templates/KafkaToGcsFlex.java	0.00% <0.00%> (ø)

... and 3 files with indirect coverage changes