ci: changes e2e workflow trigger

[amagyar-iohk]

Description:

Master branch has been renamed to main. This PR fixes the event that trigger the e2e execution

Checklist:

• [x] My PR follows the contribution guidelines of this project
• [x] My PR is free of third-party dependencies that don't comply with the Allowlist
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works
• [x] I have checked the PR title to follow the conventional commit specification

[github-actions[bot]]

Lines	Statements	Branches	Functions
	72.77% (2072/2847)	61.53% (947/1539)	79.05% (570/721)

JUnit

Tests	Skipped	Failures	Errors	Time
434	6 :zzz:	0 :x:	0 :fire:	1m 6s :stopwatch: