disallow config region changes when NO_MULTIREGION_TEST set

[dlambrig]

Disallow config region changes when NO_MULTIREGION_TEST set.

This does not cover changing the log_version, which will be handled separately (see PR 12141).

Tested by enabling version vector and running tests/slow/ConfigureTest.toml 100000 times.
20250721-235410-dlambrig-346e57742af4138b

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[foundationdb-ci]

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[foundationdb-ci]

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[foundationdb-ci]

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[foundationdb-ci]

Result of foundationdb-pr-clang on Linux RHEL 9

• Commit ID: 6fc1fdb
• Duration 3:00:09
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• Error: Build has timed out.
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[sbodagala]

If we return here wouldn't the "config" be empty with no information about "usable_regions"?