Skip subscription-invoice test while #2115 temp fix is active

[maebeale]

🤖 suggested review level: 3 Read 📖 one-line test change reconciling the spec with #2115's temp fix

What is the goal of this PR and why is this important?

• The suite is red on main: Fix charge.succeeded webhook crash on removed Charge#subscription #2114 added the invoice-based subscription-skip guard + a spec asserting the skip; temp fix #2115 ("temp fix") commented the guard out but left the spec, so the skip it expects no longer happens.

How did you approach the change?

• Skip that one example (skip with a note tying it to temp fix #2115) so the suite is green while the guard is off, and it reactivates the moment the guard is uncommented.
• Deliberately did not re-enable the guard — disabling it was the intent of temp fix #2115.

Anything else to add?

• Trade-off: subscription-skip behavior is untested until the guard is restored. Alternative was to flip the test to assert the current temp reality (invoice charge creates an EPP); chose skip so restoring the guard needs no test rewrite.

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