Run one testsuite with observers enabled in CI (#13869)

Signed-off-by: Bob Weinand <bobwei9@hotmail.com>

Fix unescaped {TMP} variables in tests

On Windows {TMP} can return ~, which will result in a parse error

Fix class link observer with file_cache_only=1

Previously, notify would only get called on classes with CE_CACHE.
However, during compilation class names are non-permanent which won't

Fix class link observer with file_cache_only=1

Previously, notify would only get called on classes with CE_CACHE.
However, during compilation class names are non-permanent which won't
get a CE_CACHE and thus wouldn't not get notified.

Closes GH-9550

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