Update hack/new_version.sh script and generate v2beta16

[MarlonGamez]

Description
Generates schema version v2beta16.
This will unblock #5706
Also updates the code related to hack/new_version.sh to be aligned with refactor introduced by #5728.

[tejal29]

Thanks for fixing the hack script. Can you please link or mention the config changes for which we are doing the schema bump?

[tejal29]

Thanks! Approved!

[codecov]

Codecov Report

Merging #5748 (b67d899) into master (d38ab4d) will decrease coverage by 0.20%.
The diff coverage is 27.02%.

@@            Coverage Diff             @@
##           master    #5748      +/-   ##
==========================================
- Coverage   70.87%   70.66%   -0.21%     
==========================================
  Files         421      423       +2     
  Lines       16087    16165      +78     
==========================================
+ Hits        11401    11423      +22     
- Misses       3850     3901      +51     
- Partials      836      841       +5     

Impacted Files	Coverage Δ
pkg/skaffold/schema/latest/v1/config.go	58.82% <ø> (ø)
pkg/skaffold/schema/v2beta14/upgrade.go	100.00% <ø> (ø)
pkg/skaffold/schema/versions.go	82.41% <ø> (ø)
pkg/skaffold/schema/v2beta15/config.go	20.58% <20.58%> (ø)
pkg/skaffold/schema/v2beta15/upgrade.go	100.00% <100.00%> (ø)
pkg/skaffold/util/tar.go	50.66% <0.00%> (-5.34%)	⬇️
pkg/skaffold/errors/errors.go	95.45% <0.00%> (+0.14%)	⬆️
pkg/skaffold/docker/parse.go	87.14% <0.00%> (+0.95%)	⬆️
... and 1 more

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