Support array in (last)indexOf function

[stan-sz]

Fixes #4895

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[anthony-c-martin]

The changes look great! I'm just putting a block on this PR as we need to wait for the ARM release train to complete to all regions and national clouds before merging.

[stan-sz]

The reported failure is a flaky test, can you confirm?

[anthony-c-martin]

FYI, this is present in ARM builds 2021w51 and later. Once this has been deployed to all clouds, we can merge this PR.

[shenglol]

The new functions are deployed everywhere.