Kotlin analysis is incompatible with Kotlin 1.8.0, which is now rolling
out to the Actions runner images.
While we work on a more permanent fix to our PR checks, this will
prevent us losing other
test coverage.
This commit adds the packs and queries from the actions input to the
config file used by the CodeQL CLI.
When the `+` is used, the actions input value is combined with the
config value and when it is not used, the input value overrides the
config value.
This commit also adds a bunch of integration tests for this feature.
In order to avoid adding too many new jobs, all of the tests are
run sequentially in a single job (matrixed across relevant operating
systems and OSes).
