Drop word "Platform" from Camunda product name

[barmac]

What should we do?

Change occurrences of "Camunda Platform [version]" to "Camunda [version]" in text visible to user:

- Camunda Platform 8
+ Camunda 8

For the XML/JSON content, leave it as is.

Use this search for potential changes: https://github.com/search?q=repo%3Acamunda%2Fcamunda-modeler+%22Camunda+Platform%22&type=code

Documentation changes are handled separately by the Documentation team.

Why should we do it?

Renaming is rolled out across all products. More at https://confluence.camunda.com/pages/viewpage.action?spaceKey=HAN&title=Internal+Guidance+on+Product+Name%2C+Version%2C+and+Packaging

Related to https://github.com/camunda/product-hub/issues/1560

[barmac]

Related Slack conversation: https://camunda.slack.com/archives/CKGH9LR40/p1694192229691829