feat: Allow lifecycle exclusions for Tags

[lukemurraynz]

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Description

As part of a Subscription vending implementation, I am designing a Sandbox environment, i.e. time-limited subscriptions; as part of this, an Expiry-Date tag is added for 3 months as part of the deployment, however with each deployment - this date gets extended.

Timestatic allows the time to be set in stone, but I want to be able to allow a subscription extension (ie someone can go into the Azure Portal and update the date on the Tags to a new extended timeline).

Describe the solution you'd like

Tags that are set on the: subscription_tags, allowed to be output and specific tags ignored for changes after deployment (ie expiry_date)