Allow undefined jurisdiction param

[maxmcd]

closes #6551

Update the javascript override to match the underlying c++ function.

[ask-bonk]

The change is straightforward and correct. The C++ signature already accepts jsg::Optional<kj::Maybe<kj::String>>, meaning undefined is valid at runtime. The PR simply updates the JSG_TS_OVERRIDE blocks in actor.h and the generated type snapshots to match. Let me just double-check that both JSG_TS_OVERRIDE branches (the getDurableObjectGetExisting and the else branch) were both updated:

The diff shows both branches at lines 272 and 278 were updated. The generated snapshots in types/generated-snapshot/ for both latest and experimental are also updated consistently.

This is a correct, minimal fix that aligns TypeScript types with the already-existing C++ behavior. No backward compatibility concern (it only widens the accepted type). No security concern. No missing compat flag needed (the C++ behavior is unchanged).

LGTM

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