Move travis phpunit test preparations into a bash script

[yvesh]

Pull Request for #11420.

Summary of Changes

As asked by @rdeutz in #11420 phpunit tests should not be executed when running the javascript tests. In order to achieve that we need to clean up the .travis.yml and move the tests setup to a separate bash script.

This also has the advantage that the formatting and execution workflow can be improved over the one liners we have because of travis now. (Not done with this PR)

Testing Instructions

Review and check the travis log

Documentation Changes Required

None

[rdeutz]

I have tested this item ✅ successfully on 23e6e6b

Works as expected

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[andrepereiradasilva]

I have tested this item ✅ successfully on 23e6e6b

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[brianteeman]

RTC

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[jeckodevelopment]

I have tested this item ✅ successfully on 23e6e6b

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[mbabker]

A little late to the party but can someone move the shell script to the build/travis directory? It's only usable in the Travis environment so it's better to have it there versus in the tests directory. Either that or rename the file to make it perfectly clear it's a Travis environment configuration script.

[rdeutz]

Makes sense I will make a PR to move the file