[metrics-bugs] #25307 [Metrics/CollecTor]: Use `persist` package for writing bridge descriptors in sanitization module

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#25307: Use `persist` package for writing  bridge descriptors in sanitization
module
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     Reporter:  iwakeh             |      Owner:  metrics-team
         Type:  enhancement        |     Status:  new
     Priority:  Medium             |  Milestone:
    Component:  Metrics/CollecTor  |    Version:
     Severity:  Normal             |   Keywords:
Actual Points:                     |  Parent ID:
       Points:                     |   Reviewer:
      Sponsor:                     |
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 As the summary says.

 Should the old behavior be kept:
 Quote from comment 1 in #23421:
    after sanitation the descriptor is written; if one descriptor cannot be
 sanitized, it is skipped

 Shouldn't we rather store all proper sanitized descriptors?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25307>
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