[Feature Request]: Publish new module version only if bicep/json templates are changed

### Description

Update publishing logic to only publish a new version if module templates (bicep/json) are changed. Currently diff is evaluating if any file in the module folder is changed, including tests and readme files, which should not be the case.

This issue must be prioritized as also blocking issue #1648

An additional challenge to this topic is to consider nested and cross referenced modules changes, since those are part of the resulting compiled json template actually published to both bicep registry and template specs.

Suggestion is therefore to consider changes to the resulting compiled json template.