Add CSP check for inline style attribute (#36923)

To be able to abort the update, extract the functionality into a
separate method. Otherwise, we don't run the `node.rev_version` at the
end, which according to the comment is probably important.

Not all `style-src` tests pass and I don't fully understand why yet, but
I presume it has to do with some special quirks of stylesheets that
other CSP checks don't have. All `style-src-attr-elem` tests pass
though.

Part of #4577

Signed-off-by: Tim van der Lippe <tvanderlippe@gmail.com>

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