chore: Fix BuildContextCompressionLevel description, output the level

[idsulik]

Description

1. Fixed BuildContextCompressionLevel description
2. Add logging for the compression level - using gzip compression level {level}

[ghost]

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[katiexzhang]

Thanks for the change @idsulik, although since there is no explicit request for this, I don't think it's necessary.

[idsulik]

@katiexzhang , what do you mean? the description isn't full, how does the user should know what value they can use and what does it mean?

[idsulik]

gzip compression level for the build context.

https://skaffold.dev/docs/references/yaml/#build-artifacts-kaniko-buildContextCompressionLevel

who knows what compression levels gzip has? I didn't even know until I made this feature.
Originally, I wrote all the levels in the description just for this purpose, so that the documentation would show it and the developers would know what value they could substitute, but because of a bug in the documentation generation, not the full description was published, and I didn't notice it.

[katiexzhang]

Where are you getting these descriptions from, specifically the -2? If possible, could you use the description from public docs, like https://docs.python.org/3/library/gzip.html.

Also I think you accidentally removed the default value.

[idsulik]

1. from here https://pkg.go.dev/compress/flate#pkg-constants, and it's the strong reason to put all the values in the docs, there is no need to wait while someone explicitly asks to do so
2. the changes contain default value as well

[katiexzhang]

This line was removed: "default": "1"

[idsulik]

oh, sorry, haven't noticed it. pushed fix