IDE-298 Deleted All CatBlock-related src code

[khaledelnaggar]

Delete CatBlocks code from repository. This includes deleting the source code and the relevant tests.
https://catrobat.atlassian.net/browse/IDE-298

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[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Frajhamster]

Approved, looks good.

[dorianpercic]

Added the following:

• Removed the Catblocks strings from the translations.
• Removed the Catblocks build config.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud