tests: runtime: filter_modify: add test case for #4319
tests: runtime: filter_modify: add test case for #4319

Key_value_does_not_equal is true if the key does not exist.
Key_value_does_not_match is also affected.
https://github.com/fluent/fluent-bit/issues/4319

Signed-off-by: Takahiro Yamashita <8b9f03f78cb27351a99f79113f99e589b65190d5@gmail.com>

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