Add "text/javascript" to compressible MIME types

[stramel]

What this PR does / why we need it:
This PR adds the MIME type text/javascript to the default MIME type lists for Brotli and Gzip. This addition is based around documentation of the HTML Standard which states,

Servers should use text/javascript for JavaScript resources.

Currently, this MIME type doesn't get compressed when sent.

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[stramel]

I didn't see any associated tests but would be happy to add some if they are necessary and someone can point me in the right direction. I also have signed the CLA.

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@stramel: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

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/ok-to-test

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[aledbf]

/ok-to-test

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@d460147). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #4162   +/-   ##
=========================================
  Coverage          ?   57.65%           
=========================================
  Files             ?       87           
  Lines             ?     6459           
  Branches          ?        0           
=========================================
  Hits              ?     3724           
  Misses            ?     2305           
  Partials          ?      430

Impacted Files	Coverage Δ
internal/ingress/controller/config/config.go	98.56% <ø> (ø)

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[aledbf]

@stramel please squash the commits

[stramel]

@aledbf Sorry about that. I have squashed the commits.

[aledbf]

/lgtm
/approve

[aledbf]

@stramel thanks!

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf, stramel

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