Add decompiler support for templateLink.relativePath

[anthony-c-martin]

Contributing a Pull Request

If you haven't already, read the full contribution guide. The guide may have changed since the last time you read it, so please double-check. Once you are done and ready to submit your PR, run through the relevant checklist below.

Contributing a feature

• I have opened a new issue for the proposal, or commented on an existing one, and ensured that the Bicep maintainers are good with the design of the feature being implemented
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Fixes #1849

[majastrz]

[anthony-c-martin]

Fixes #1990