runtime(syntax-tests): Support sourceable Vim configuration for syntax tests

Not all programming languages support comments; without such
support, the TEST_SETUP functionality that offers embeddable
Vim Ex commands may no longer be applicable.

We can achieve similar functionality by storing Ex commands
in a Vim file with its basename matching the basename of the
test file, and having this Vim file sourced, and then having
the test file loaded and tested.  When such a Vim file would
be used for a language that has comments and whose matching
test file has embedded TEST_SETUP lines, we will accommodate
it by letting the TEST_SETUP lines augment and/or overrule
sourced configuration.

Further details can be found in the discussion thread at
https://github.com/vim/vim/discussions/14117.

related: #14215

Signed-off-by: Aliaksei Budavei <0x000c70@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

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