Disable colouring and emojis on windows

[chmouel]

Fixes #914 and #915

Changes

This will disable colouring and emojis on windows platform. Since windows
terminal doesn't fully supports it.

Submitter Checklist

These are the criteria that every PR should meet, please check them off as you
review them:

• Includes tests (if functionality changed/added)
• Run the code checkers with make check
• Regenerate the manpages, docs and go formatting with make generated
• Commit messages follow commit message best practices

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for more details.

Release Notes

Colours and emojis are disabled on windows platforms.

[linux-foundation-easycla]

The committers are authorized under a signed CLA.

• ✅ Chmouel Boudjnah (0bb1d78)

[vdemeester]

/meow

[tekton-robot]

@vdemeester:

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/meow

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[tekton-robot]

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[tekton-robot]

The following is the coverage report on pkg/.
Say /test pull-tekton-cli-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/flags/flags.go	18.8%	17.6%	-1.1

[chmouel]

tested as working on #914 (comment) by veeresh

[vdemeester]

/lgtm