meta: add an option no-bgjob to disable background jobs

[SandyXSD]

close #1337

[codecov-commenter]

Codecov Report

Merging #1472 (8e902ab) into main (fcf13cc) will decrease coverage by 0.05%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##             main    #1472      +/-   ##
==========================================
- Coverage   59.32%   59.26%   -0.06%     
==========================================
  Files         131      131              
  Lines       21963    21991      +28     
==========================================
+ Hits        13029    13033       +4     
- Misses       7379     7404      +25     
+ Partials     1555     1554       -1     

Impacted Files	Coverage Δ
cmd/gateway.go	29.28% <0.00%> (-0.17%)	⬇️
pkg/meta/config.go	100.00% <ø> (ø)
pkg/meta/base.go	72.08% <66.66%> (-0.21%)	⬇️
cmd/mount.go	72.95% <100.00%> (+0.43%)	⬆️
pkg/meta/redis.go	71.25% <100.00%> (+0.10%)	⬆️
pkg/utils/utils.go	75.00% <0.00%> (-8.73%)	⬇️
pkg/chunk/cached_store.go	70.76% <0.00%> (-3.47%)	⬇️
pkg/chunk/disk_cache.go	79.80% <0.00%> (-0.50%)	⬇️
pkg/object/swift.go	4.65% <0.00%> (-0.12%)	⬇️
pkg/meta/sql.go	68.33% <0.00%> (-0.06%)	⬇️
... and 8 more

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