[IMPROVED] De-flake TestHotSpotReconnect and fix kv per key TTL test

[piotrpio]

• Increase the acceptable client connection count after reconnect to de-flake the test.
• Fix test checking for limit marker after purge (server behavior changed in [FIXED] No redundant limit marker on KV purge nats-server#7026

Signed-off-by: Piotr Piotrowski piotr@synadia.com

[coveralls]

coverage: 84.943% (-0.006%) from 84.949%
when pulling a09d132 on fix-hotspot-reconnect-test
into 0ed8647 on main.

[Copilot]

Pull Request Overview

This PR improves test stability by de-flaking the TestHotSpotReconnect test and fixing a KV per-key TTL test that was broken due to server behavior changes.

• Increased acceptable client connection variance from 40% to 50% in TestHotSpotReconnect
• Removed obsolete test code checking for marker existence after purge in TestKeyValueLimitMarkerTTL
• Updated various dependencies to newer versions in test modules

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
test/cluster_test.go	Increased tolerance threshold for client distribution to reduce test flakiness
jetstream/test/kv_test.go	Removed test code that checked for markers after purge, which is no longer valid behavior
go_test.mod	Updated dependency versions including nats-server and other packages
go_test.sum	Updated checksums for dependency version changes

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[Jarema]

LGTM