Split CI pipelines (#23385)

- This PR attempts to split our various DB tests into separate
pipelines.
- It splits up some of the extra feature-related tests rather than
having most of them in the MySQL test.
- It disables the race detector for some of the pipelines as well, as it
can cause slower runs and is mostly redundant when the pipelines just
swap DBs.
- It builds without SQLite support for any of the non-SQLite pipelines.
- It moves the e2e test to using SQLite rather than PG (partially
because I moved the minio tests to PG and that mucked up the test
config, and partially because it avoids another running service)
- It splits up the `go mod download` task in the Makefile from the tool
installation, as the tools are only needed in the compliance pipeline.
(Arguably even some of the tools aren't needed there, but that could be
a follow-up PR)
- SQLite is now the only arm64 pipeline, moving PG back to amd64 which
can leverage autoscaler

Should resolve #22010 - one thing that wasn't changed here but is
mentioned in that issue, unit tests are needed in the same pipeline as
an integration test in order to form a complete coverage report (at
least as far as I could tell), so for now it remains in a pipeline with
a DB integration test.

Please let me know if I've inadvertently changed something that was how
it was on purpose.

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I will say sometimes it's hard to pin down the average time, as a
pipeline could be waiting for a runner for X minutes and that brings the
total up by X minutes as well, but overall this does seem to be faster
on average.

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Signed-off-by: jolheiser <[email protected]>
Co-authored-by: techknowlogick <[email protected]>