refactor(): refactor exception handlers

[TheKhanj]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/nestjs/nest/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

[coveralls]

Pull Request Test Coverage Report for Build 45e90302-44ea-46ab-a87d-288a57a77905

• 13 of 13 (100.0%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.004%) to 93.808%

---

Totals
Change from base Build ec438b34-a56e-4f82-ae11-45373f207a16:	-0.004%
Covered Lines:	6090
Relevant Lines:	6492

---

💛 - Coveralls

[TheKhanj]

Any opinion about these changes?🤔

[kamilmysliwiec]

LGTM

[TheKhanj]

Tnx 😍