This commit updates LogFollower class to handle carriage return
characters in LAVA logs. LAVA treats carriage return characters as a
line break, so each carriage return in an output console is mapped to a
console line in LAVA.
The updated LogFollower class now merges lines that end with a carriage
return character into a single line, making the Gitlab sections work
correctly. In addition, the `remove_trailing_whitespace` method has been
updated to remove trailing `\r\n` characters from log lines.
The `test_lava_log_merge_carriage_return_lines` test function has also
been updated to test for carriage returns at the end of the previous
line.
Closes: #8242
Signed-off-by: Guilherme Gallo <guilherme.gallo@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21614>
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