Make the backup check interval configurable

[sabeechen]

No description provided.

[github-actions]

Test Results

434 tests  +433   434 ✅ +434   6m 31s ⏱️ + 6m 31s
  1 suites ±  0     0 💤 ±  0 
  1 files   ±  0     0 ❌ ±  0 

Results for commit 93eb7fc. ± Comparison against base commit 19fd8cc.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

Attention: Patch coverage is 81.81818% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 89.38%. Comparing base (0339628) to head (93eb7fc).
Report is 50 commits behind head on dev.

❗ Current head 93eb7fc differs from pull request most recent head 8c64950. Consider uploading reports for the commit 8c64950 to get more accurate results

Files	Patch %	Lines
...oogle-drive-backup/backup/config/durationparser.py	75.00%	3 Missing ⚠️
hassio-google-drive-backup/backup/model/syncer.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1009      +/-   ##
==========================================
- Coverage   89.40%   89.38%   -0.03%     
==========================================
  Files          78       79       +1     
  Lines        6419     6545     +126     
==========================================
+ Hits         5739     5850     +111     
- Misses        680      695      +15     

Flag	Coverage Δ
unittests	89.38% <81.81%> (-0.03%)	⬇️

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