Fix YTT processing for passwords with yaml special chars

[tenczar]

Fixes our yaml processor so that passwords are passed to ytt as string values. This fixes a bug that would occur when a special characters in password would act like yaml structures and cause parsing errors. Examples: any password starting with an ! would be empty in ytt as yaml treats a string starting with the bang as a tag, Any password ending with a colon (:) would be treated as an empty map and not a string causing parsing errors.

What this PR does / why we need it

Which issue(s) this PR fixes

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[github-actions]

Cluster Generation A/B Results:
https://storage.googleapis.com/tkg-clustergen/4548/20230404223414/clustergen.diff.txt
Author/reviewers:
Please review to verify that the effects on the generated cluster configurations are exactly what the PR intended, and give a thumbs-up if so.

[github-actions]

Cluster Generation A/B Results:
https://storage.googleapis.com/tkg-clustergen/4548/20230406180652/clustergen.diff.txt
Author/reviewers:
Please review to verify that the effects on the generated cluster configurations are exactly what the PR intended, and give a thumbs-up if so.

[github-actions]

Cluster Generation A/B Results:
https://storage.googleapis.com/tkg-clustergen/4548/20230406202803/clustergen.diff.txt
Author/reviewers:
Please review to verify that the effects on the generated cluster configurations are exactly what the PR intended, and give a thumbs-up if so.

[codecov]

Codecov Report

Merging #4548 (f32efce) into main (7cf3455) will decrease coverage by 0.87%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #4548      +/-   ##
==========================================
- Coverage   49.78%   48.92%   -0.87%     
==========================================
  Files         453      483      +30     
  Lines       45379    47503    +2124     
==========================================
+ Hits        22594    23243     +649     
- Misses      20632    22060    +1428     
- Partials     2153     2200      +47     

Impacted Files	Coverage Δ
tkg/yamlprocessor/ytt.go	73.27% <100.00%> (-0.91%)	⬇️

... and 35 files with indirect coverage changes

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