Units(TOML): add a case triggering an infinite loop

Signed-off-by: Masatake YAMATO <yamato@redhat.com>

Author: masatake

Units/parser-toml.r/garbage-at-eof.b/README

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+Taken from https://github.com/BurntSushi/toml/raw/refs/heads/master/internal/toml-test/tests/invalid/encoding/bad-utf8-at-end.toml
+With this input, the TOML parser entered an infinite loop.

Units/parser-toml.r/garbage-at-eof.b/expected.tags

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+x	input.toml	/^x = """"""�/;"	K

Units/parser-toml.r/garbage-at-eof.b/features

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+packcc

Units/parser-toml.r/garbage-at-eof.b/input.toml

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+# There is a 0xda at after the quotes, and no EOL at the end of the file.
+#
+# This is a bit of an edge case: This indicates there should be two bytes
+# (0b1101_1010) but there is no byte to follow because it's the end of the file.
+x = """"""Ú