QString: further optimize the invalid regex warning6.9

Error handling code has no business bloating Qt executable code size,
so take two more steps to reduce its impact, on top of the locking it
away in a Q_DECL_COLD_FUNCTION:

First, split the 'where' argument into 'class' and 'method', in order
to facilitate the reuse of the class strings across users.

Second, move the QRegularExpression::pattern() call into the warning
function, to centralize the temporary QString handling code.

Saves half a KiB in text size on optimized Clang 19 Linux AMD64 C++23
builds.

Pick-to: 6.8
Change-Id: I7fe23bdafc9f63d0d43b801e704866be9961648c
Reviewed-by: Thiago Macieira <[email protected]>
(cherry picked from commit c1a4f722eca79a1811304a47349d332d57a86704)
Reviewed-by: Qt Cherry-pick Bot <[email protected]>
(cherry picked from commit a9222a900d718ecdbf9d88485ceeb9f871e2c331)

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