feat(vpc-gw): add edit mode for PAT rules

[yfodil]

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Relates OR Closes #0000

Release note for CHANGELOG:

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 57 lines in your changes missing coverage. Please review.

Project coverage is 54.63%. Comparing base (5bf53e0) to head (3edcea1).
Report is 670 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/namespaces/vpcgw/v2/custom_pat_rule.go	0.00%	51 Missing ⚠️
internal/namespaces/vpcgw/v2/custom.go	0.00%	4 Missing ⚠️
internal/namespaces/vpcgw/v2/custom_gateway.go	0.00%	2 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (5bf53e0) and HEAD (3edcea1). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (5bf53e0)	HEAD (3edcea1)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #4798       +/-   ##
===========================================
- Coverage   75.45%   54.63%   -20.83%     
===========================================
  Files         202      316      +114     
  Lines       44323    80838    +36515     
===========================================
+ Hits        33444    44165    +10721     
- Misses       9653    35265    +25612     
- Partials     1226     1408      +182     

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