Unflake SpannerGaxRetryTest

[kolea2]

Reverting HUNDRED_MS to ONE_SECOND

[codecov]

Codecov Report

Merging #6184 into master will decrease coverage by 0.28%.
The diff coverage is n/a.

@@ Coverage Diff @@## master #6184 +/- ##
============================================
- Coverage 47.5% 47.22% -0.29% 
Complexity 27432 27432 ============================================
Files 2523 2523 Lines 274592 274451 -141 Branches 31401 30578 -823 ============================================
- Hits 130439 129597 -842 + Misses 134520 134432 -88 - Partials 9633 10422 +789

Impacted Files	Coverage Δ	Complexity Δ
...va/com/google/cloud/compute/v1/InstanceClient.java	48.8% <0%> (-6.45%)	143% <0%> (ø)
.../com/google/cloud/compute/v1/RegionDiskClient.java	47.9% <0%> (-5.99%)	43% <0%> (ø)
...ava/com/google/cloud/compute/v1/ProjectClient.java	51.14% <0%> (-5.94%)	55% <0%> (ø)
...ava/com/google/cloud/compute/v1/NetworkClient.java	49.63% <0%> (-5.84%)	35% <0%> (ø)
...ava/com/google/cloud/compute/v1/LicenseClient.java	50.41% <0%> (-5.79%)	31% <0%> (ø)
...va/com/google/cloud/compute/v1/SnapshotClient.java	50% <0%> (-5.74%)	31% <0%> (ø)
.../java/com/google/cloud/compute/v1/ImageClient.java	49.04% <0%> (-5.74%)	43% <0%> (ø)
.../google/cloud/compute/v1/TargetSslProxyClient.java	48.57% <0%> (-5.72%)	35% <0%> (ø)
.../google/cloud/compute/v1/SecurityPolicyClient.java	48.1% <0%> (-5.7%)	39% <0%> (ø)
...d/compute/v1/RegionInstanceGroupManagerClient.java	48.81% <0%> (-5.69%)	51% <0%> (ø)
... and 178 more

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[olavloite]

Yes, that's a good idea.