[RunAllTests] Fix failing RetreiveLicenseTextsTest on CI

[prayutsu]

Explanation

RetrieveLicenseTextsTest is failing to build in the latest develop. This PR corrects the visibility of LicenseFetcher library and add imports at required places.

Checklist

• The PR title starts with "Fix #bugnum: ", followed by a short, clear summary of the changes. (If this PR fixes part of an issue, prefix the title with "Fix part of #bugnum: ...".)
• The PR explanation includes the words "Fixes #bugnum: ..." (or "Fixes part of #bugnum" if the PR only partially fixes an issue).
• The PR follows the style guide.
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• The PR is made from a branch that's not called "develop".
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[BenHenning]

Thanks @prayutsu. This LGTM.