Adding llnl-ci-pip.yml & llnl-ci-conda.yml & llnl-ci-spack.yml

[RamonAra209]

Adding llnl-ci.yml files to test installations for pip and conda

Creating a new file to house spack installation.

Adding a wrapper for the three installation files, llnl-ci.yml, that will run the three llnl-ci-<installation-type>.ymls in parallel.

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