removed ci steps from running on main after merge

[zees-dev]

Description

This pull request updates GitHub Actions workflows related to Rust linting and code coverage.
The changes simplify the workflows by removing unused triggers and steps, focusing on pull request events targeting the main branch.

Changes to .github/workflows/rust-clippy.yml:

• Removed the push and schedule triggers, leaving only the pull_request trigger for the main branch.
• Deleted the step that uploads analysis results to GitHub, streamlining the workflow.

Changes to .github/workflows/rust-grcov.yml:

• Replaced the combined push and pull_request triggers with a specific pull_request trigger targeting the main branch.

[coveralls]

Pull Request Test Coverage Report for Build 16358143170

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 7.78%

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Totals
Change from base Build 16358073001:	0.0%
Covered Lines:	5715
Relevant Lines:	73459

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💛 - Coveralls