Baseline: 67446d62

Cherry picks:

   + 4344a035:
     Automated rollback of commit
     00a4fefe.

Incompatible changes:

  - `--incompatible_check_sharding_support` is enabled by default.
    Sharded tests with test runners that do not properly advertise
    support for test sharding will fail. Refer to
    https://github.com/bazelbuild/bazel/issues/18339 for migration
    advice.

Important changes:

  - Options specified on the pseudo-command `common` in `.rc` files
    are now ignored by commands that do not support them as long as
    they are valid options for *any* Bazel command. Previously,
    commands that did not support all options given for `common`
    would fail to run. These previous semantics of `common` are now
    available via the new `always` pseudo-command.
  - the 'default' param of json.decode can now be used as a keyword
    parameter.
  - As a transitional step in a larger refactoring, rule transitions
    are applied twice. Once during dependency resolution and once
    right before
    analysis of those rules. After the refactoring is complete, rule
    transitions
    will be applied only once.

This release contains contributions from many people at Google, as well as Fabian Meumertzheim, Jimm chja20, Keith Smiley.