Add stage under apiGateway to override default.

[pavanandhukuri]

Adds new property under apiGateway to override default

Addresses: #8346

[codecov]

Codecov Report

Base: 85.79% // Head: 85.79% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (d554c87) compared to base (d1d9494).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #11487   +/-   ##
=======================================
  Coverage   85.79%   85.79%           
=======================================
  Files         314      314           
  Lines       13259    13261    +2     
=======================================
+ Hits        11375    11377    +2     
  Misses       1884     1884           

Impacted Files	Coverage Δ
...ompile/events/api-gateway/lib/hack/update-stage.js	95.06% <100.00%> (ø)
lib/plugins/aws/provider.js	94.70% <100.00%> (+0.03%)	⬆️

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[medikoo]

Thank you @pavanandhukuri! That looks very good

[jattkaim]

@pavanandhukuri This is currently not functional, was this ever functional? see that the tests are passing and the code itself seems quite simple. Unsure why this is currently not functional.

[medikoo]

@jattkaim @pavanandhukuri as I check, this PR covered support for it in updates that Framework does after CF deployment finalizes, the updates made directly with AWS SDK.

What was omitted is the resolution of the custom stage name for deployment resource in CF template. So technically, this never worked correctly.