validation/microdeposits: add a config for withdrawing from savings accounts

[adamdecaf]

Fixes: https://github.com/moov-io/paygate/issues/541

[codecov-commenter]

Codecov Report

Merging #551 into master will decrease coverage by 0.81%. The diff coverage is 60.00%.

@@            Coverage Diff             @@
##           master     #551      +/-   ##
==========================================
- Coverage   54.02%   53.21%   -0.82%     
==========================================
  Files         102      102              
  Lines        3815     3845      +30     
==========================================
- Hits         2061     2046      -15     
- Misses       1384     1433      +49     
+ Partials      370      366       -4     

Impacted Files	Coverage Δ
pkg/config/validation.go	75.00% <ø> (ø)
pkg/validation/microdeposits/micro_deposits.go	70.51% <60.00%> (-0.73%)	:arrow_down:
pkg/transfers/pipeline/notify/pagerduty.go	0.00% <0.00%> (-100.00%)	:arrow_down:
pkg/tenants/mock_repository.go	16.66% <0.00%> (-16.67%)	:arrow_down:
pkg/tenants/router.go	62.50% <0.00%> (-5.07%)	:arrow_down:
pkg/config/pipeline.go	61.29% <0.00%> (ø)
pkg/transfers/router.go	58.41% <0.00%> (+0.20%)	:arrow_up:
pkg/upload/sftp.go	69.10% <0.00%> (+2.61%)	:arrow_up:

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