Remove Sanitizer Limitations from MTR Tests

To increase the coverage of ASAN, UBSAN and MSAN in our codebase, we should seek to lift the not_*san.inc restrictions from our tests by.

The reasons we limited certain tests from the *SANs include:

Sanitizer bug

This is the primary reason (or at least should be).
However, with the maturity of these tools, up-to-date versions likely have already fixed these bugs.
If more arise, we should expedite upstream corrections rather than put a not_*san.inc lid on them.

"Temporary" kludge to unblock others' work

We should correct the underlying problem.
Nothing is more permanent than the temporary, quoted svoj.

Performance (2× for ASAN, 3× for MSAN)

• The tax is worth the guarantee.
  We wouldn't have sanitizer CIs (such as MDBF-1076) at all if this is that much of a concern.
• Merging multiple cases already makes a slow kilo-line test.
  Conversely, perhaps we should rethink our "big" tests.