Migrate SKIPIF -> EXTENSIONS (#7138)

This is an automated migration of most SKIPIF extension_loaded checks.

Fix #78912: INTL Support for accounting format

We provide `NumberFormatter::CURRENCY_ACCOUNTING` to wrap
`UNUM_CURRENCY_ACCOUNTING `[1].

[1] <https://unicode-org.github.io/icu-d

Fix #78912: INTL Support for accounting format

We provide `NumberFormatter::CURRENCY_ACCOUNTING` to wrap
`UNUM_CURRENCY_ACCOUNTING `[1].

[1] <https://unicode-org.github.io/icu-docs/apidoc/released/icu4c/unum_8h.html#a4eb4d3ff13bd506e7078b2be4052266dae97cdd7ed612d07d251021c076efb1c5>

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