[issue30869] regrtest: Add .idlerc to saved_test_environment

[Terry J. Reedy]

Terry J. Reedy added the comment:

#27534 is about reducing run's imports.  I believe that the current patch may remove one path by which config is indirectly imported.  While writing msg297983 of #30868, I remembered that config files are not the only files put in .idlerc.  So a solution to block writing config files while testing is not enough.  An in-memory .idlerc with StringIOs for files, both for testing and for user systems without a place to write it, is looking more inviting to me than it did yesterday.

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