test-bot: better xml character filtering
test-bot: better xml character filtering

Ref:
 - http://www.w3.org/TR/xml/#charsets
 - http://stackoverflow.com/a/14323524

Closes #50092.

Signed-off-by: Xu Cheng <9a05244150b861e40c78843b801eed71bca54eac@me.com>

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