YBC Tests: Fix TS Web access retry loop in YBC

[OlegLoginov]

Jira Link: DB-11420

Description

Fix the tests:

YB_DISABLE_MINICLUSTER_BACKUP_TESTS=0 YB_TEST_YB_CONTROLLER=1  ./yb_build.sh --cxx-test integration-tests_cql-backup-test --gtest_filter CqlBackupTest.TestBackupWithoutTSWebUI

YB_DISABLE_MINICLUSTER_BACKUP_TESTS=0 YB_TEST_YB_CONTROLLER=1  ./yb_build.sh --cxx-test integration-tests_cql-backup-test --gtest_filter CqlBackupTest.TestBackupRestoreWithoutTSWebUI

YBC is loading TS config via TS HTTP UI endpoint: <ts-ip>/varz.
In these 2 tests we stop&start this HTTP server, so YBC should do retries during the endpoint accessing.
Locally the tests work fine, but in Jenkins environment YBC cannot get the TS config.

It should be fixed in YBC - try to increase number of retries and/or timeout:
Hardcoded timeout = 1 sec in ServerConfig():

 ControllerStatus status = EasyCurlGet(url, 1000, data);

Hardcoded number of retries in EasyCurlGet():

int retries = 5;

Issue Type

kind/enhancement

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[OlegLoginov]

Original issue: #21689