Adds a new //bazel/resmoke/multiversion package with two Bazel rules:

`multiversion_setup`: downloads old binaries via `db-contrib-tool setup-repro-env`. The rule includes an optional bazel flag that can be used to pin a specific version download for reproducing failures with exact multiversion binaries.

`multiversion_exclude_tags`: runs `resmoke.py generate-multiversion-exclude-tags` against the downloaded binaries to produce the .yml tag file of tests to exclude.

Wires multiversion setup into `resmoke_suite_test` via a new `multiversion_deps` attribute. The rule passes each dep directory as `-multiversionDir`, its tag file as `tagFile`, and reads the multiversion config to derive `-excludeWithAnyTags` for FCV-incompatible tests.

Also configures the experimental `~ Bazel Integration Tests` variant to run multiversion sanity check suites.