Disable registrar test for FirebaseSegmentation.

[diwu-arete]

No description provided.

[google-oss-bot]

@diwu-arete: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
api-information	557ea7a	link	/test api-information

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (floc-master@5943944). Click here to learn what that means.
The diff coverage is 0%.

@@              Coverage Diff               @@
##             floc-master    #1050   +/-   ##
==============================================
  Coverage               ?   57.97%           
  Complexity             ?     6199           
==============================================
  Files                  ?      628           
  Lines                  ?    30955           
  Branches               ?     4262           
==============================================
  Hits                   ?    17945           
  Misses                 ?    11584           
  Partials               ?     1426

Impacted Files	Coverage Δ	Complexity Δ
.../segmentation/local/CustomInstallationIdCache.java	0% <0%> (ø)	0 <0> (?)
...segmentation/remote/SegmentationServiceClient.java	0% <0%> (ø)	0 <0> (?)
...n/java/com/google/firebase/segmentation/Utils.java	0% <0%> (ø)	0 <0> (?)
...segmentation/SetCustomInstallationIdException.java	0% <0%> (ø)	0 <0> (?)
...ion/local/CustomInstallationIdCacheEntryValue.java	0% <0%> (ø)	0 <0> (?)
...le/firebase/segmentation/FirebaseSegmentation.java	0% <0%> (ø)	0 <0> (?)
...se/segmentation/FirebaseSegmentationRegistrar.java	0% <0%> (ø)	0 <0> (?)

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