Chore: Cleanup eslint warns

[syamsudotdev]

Monika Pull Request (PR)

What feature/issue does this PR add

1. Clean up fixable ESLint warnings

How did you implement / how did you fix it

1. Clean up ESLint warnings based on ESLint recommendations

How to test

1. npm test
2. npm pack && npm i -g hyperjumptech-monika-*.tgz
3. monika

[codecov]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (ed79689) 63.80% compared to head (d8e2c7d) 63.80%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/components/probe/prober/postgres/index.ts	20.00%	0 Missing and 4 partials ⚠️
src/components/probe/prober/http/index.ts	0.00%	1 Missing ⚠️
src/components/probe/prober/mariadb/index.ts	0.00%	0 Missing and 1 partial ⚠️
src/components/probe/prober/postgres/request.ts	66.66%	0 Missing and 1 partial ⚠️
src/plugins/metrics/prometheus/collector.ts	66.66%	0 Missing and 1 partial ⚠️
...ins/validate-response/checkers/query-expression.ts	0.00%	0 Missing and 1 partial ⚠️
src/symon/index.ts	50.00%	0 Missing and 1 partial ⚠️
src/utils/expression-parser.ts	50.00%	1 Missing ⚠️
src/utils/ping.ts	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1221   +/-   ##
=======================================
  Coverage   63.80%   63.80%           
=======================================
  Files         111      111           
  Lines        3277     3277           
  Branches      556      561    +5     
=======================================
  Hits         2091     2091           
+ Misses       1000      999    -1     
- Partials      186      187    +1     

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[sapiderman]

looks good!