refactor: periodic operations to use time.Ticker

[appleboy]

• Use time.Ticker instead of time.After for periodic operations in autoSave function
• Use time.Ticker instead of time.After for periodic operations in monitor function

Summary

This PR includes the following changes:

• Replaced time.After(interval) with time.NewTicker(interval) in both storage/store/store.go and watchdog/watchdog.go.
• This change ensures that the automatic save and monitoring operations are executed regularly and that the ticker is properly stopped when the context is done.

[appleboy]

@TwiN Please take a look mirror changes.

[TwiN]

@appleboy Thank you very much for the optimization! If you find any other small issues like this, please don't hesitate to create a pull request.

I learned Go as I was building Gatus, so some of the older code is in dire need of love.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.87%. Comparing base (dd839be) to head (88aecb3).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #978   +/-   ##
=======================================
  Coverage   75.86%   75.87%           
=======================================
  Files          74       74           
  Lines        6758     6760    +2     
=======================================
+ Hits         5127     5129    +2     
  Misses       1325     1325           
  Partials      306      306           

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[appleboy]

@TwiN

Sure, no problem. I also learned the Go language through writing a new project, Gorush. We can exchange more ideas in the future.