refactor(pass-style): refactor-only avoid symbol-named methods

[erights]

Extracted from #2797

Closes: #XXXX Refs: #2793 #2792

Description

This PR is the extraction from #2797 of only the safe pure refactor elements of #2797 as suggested by @kriskowal at https://github.com/endojs/endo/pull/2797#pullrequestreview-2865819668 . #2797 is then rebased on this one, representing only the elements whose refactor-purity was questionable.

This PR should be a pure refactor, to avoid creating remotables with symbol-named methods when there is clearly no possible compat hazard. Non-remotable objects with symbol-named methods are fine. But see Compatibility Considerations below.

Security Considerations

none

Scaling Considerations

none

Documentation Considerations

none

Testing Considerations

Most of the remotable objects with symbol-named methods were in tests. These can clearly be fixed without any compat hazard, so I count these as pure refactors. However, in removing the symbol-ness of some of these tests, I may have accidentally removed the purposes of the tests. They might now be fully redundant with other tests and should be removed. If anyone does investigate this, that cleanup could be in a later PR.

Compatibility Considerations

none. But see Compatibility Considerations of #2797

Upgrade Considerations

none