[OptBisect] Merge shouldRun logic of -opt-bisect and -opt-disable (#177122)

Hi everyone,

After the introduction of `-opt-disable` in,
one of its main limitations has been that it cannot be used together
with `-opt-bisect`, since `getGlobalPassGate()` returns either
`getOptDisabler()` or `getOptBisector()`, but not both. Allowing them to
work simultaneously would be useful for disabling individual passes
while still restricting the pipeline. This is especially relevant given
the recent updates to `-opt-bisect`, such as interval support.

For example, when a defect is caused by a particular pass but its impact
is masked by another, it can be difficult to identify the actual culprit
through bisecting alone. Being able to disable passes individually while
using `-opt-bisect` would make this process much more efficient.

In this PR, I have merged the logic of the two flags so that they can
interoperate. Specifically:

- Removed the `OptDisable` class, as its functionality has been
integrated into `OptBisect`.
- Removed the `-opt-disable-enable-verbosity` flag, since verbosity now
behaves identically to `-opt-bisect`.
- Updated all affected tests and added a new test to verify that both
flags work correctly together.

There is one potential change I am considering for clarity but have not
yet implemented. Currently, log messages continue to use the `BISECT:`
prefix. With the merged behavior, it might make sense to revise this
message to better reflect the combined functionality.