[#430] Fix clippy single match warning in package iceoryx2

[xieyuschen]

Notes for Reviewer

This change is done by calling cargo clippy --fix --lib -p iceoryx2
I'm still learning about the code of iceoryx2, so I tried to improve some of them(trivial but nice to have) during the process.

Pre-Review Checklist for the PR Author

1. Add sensible notes for the reviewer
2. PR title is short, expressive and meaningful
3. Relevant issues are linked in the References section
4. Every source code file has a copyright header with SPDX-License-Identifier: Apache-2.0 OR MIT
5. Branch follows the naming format (iox2-123-introduce-posix-ipc-example)
6. Commits messages are according to this guideline
   • Commit messages have the issue ID ([#123] Add posix ipc example)
   • Commit author matches Eclipse Contributor Agreement (and ECA is signed)
7. Tests follow the best practice for testing
8. Changelog updated in the unreleased section including API breaking changes
9. Assign PR to reviewer
10. All checks have passed (except task-list-completed)

Checklist for the PR Reviewer

• Commits are properly organized and messages are according to the guideline
• Unit tests have been written for new behavior
• Public API is documented
• PR title describes the changes

Post-review Checklist for the PR Author

1. All open points are addressed and tracked via issues

References

Relates to #430

[elBoberido]

Nice :)

[codecov]

Codecov Report

Attention: Patch coverage is 58.97436% with 16 lines in your changes missing coverage. Please review.

Project coverage is 78.95%. Comparing base (6d25b61) to head (e6ba9cc).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
iceoryx2/src/port/publisher.rs	48.27%	15 Missing ⚠️
iceoryx2/src/port/notifier.rs	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #431      +/-   ##
==========================================
+ Coverage   78.93%   78.95%   +0.02%     
==========================================
  Files         195      195              
  Lines       22840    22836       -4     
==========================================
+ Hits        18029    18031       +2     
+ Misses       4811     4805       -6     

Files with missing lines	Coverage Δ
iceoryx2/src/node/mod.rs	70.99% <ø> (ø)
iceoryx2/src/port/subscriber.rs	92.93% <100.00%> (-0.06%)	⬇️
iceoryx2/src/port/notifier.rs	90.05% <66.66%> (ø)
iceoryx2/src/port/publisher.rs	84.94% <48.27%> (-0.06%)	⬇️

... and 3 files with indirect coverage changes