applications schema - add on_premise_security_identifier

[kaovd]

Resolves #462

Ran the following tests seems to all work fine.

> $ TF_ACC=1 go test -v -timeout=2h ./internal/services/applications -run="TestAccApplication_complete"                                                     
=== RUN   TestAccApplication_complete
=== PAUSE TestAccApplication_complete
=== CONT  TestAccApplication_complete
--- PASS: TestAccApplication_complete (84.10s)
PASS
ok      github.com/hashicorp/terraform-provider-azuread/internal/services/applications  84.113s

[manicminer]

Hi @kaovd, thanks for the suggestion! As there's a lot of change going on right now in preparation for v2.0, I've cherry-picked your change into #474 with attribution, so I'll go ahead and close this PR as it'll be merged in that one. Thanks again!

[github-actions]

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