[Discover][Scout] Turn discover.isEsqlDefault off in global setup hook

[csr]

This PR temporarily sets the discover.isEsqlDefault feature flag to false for all Scout tests in the Discover plugin. These tests are currently failing in the MKI QA environment as 1) the feature flag was turned on in that environment 2) tests aren't expecting the ESQL editor to be the default editor.

We'll explore options with the team on next step - but let's disable the feature flag for the time being to unblock our Scout serverless pipeline.

See Enabling feature flags at runtime for more details on feature flags in Scout.

[kibanamachine]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 3bfccaa

Failed CI Steps

• Scout Lane #7 - stateful-classic / default
• Scout Lane #18 - serverless-observability_complete / default

Test Failures

• [job] [logs] Scout Lane #18 - serverless-observability_complete / default / local-serverless-observability_complete - Serverless Observability Navigation - Complete tier body - clicking body nav items sets the active link, updates breadcrumbs, and navigates
• [job] [logs] Scout Lane #7 - stateful-classic / default / local-stateful-classic - APM integration not installed but setup completed - Admin user
• [job] [logs] Scout Lane #7 - stateful-classic / default / local-stateful-classic - Collector integration is not installed - collector integration missing
• [job] [logs] Scout Lane #7 - stateful-classic / default / local-stateful-classic - Collector integration is not installed - Symbolizer integration is not installed
• [job] [logs] Scout Lane #7 - stateful-classic / default / local-stateful-classic - Observability Landing Page (discover.isEsqlDefault enabled) - redirects to onboarding when no logs data exists
• [job] [logs] Scout Lane #7 - stateful-classic / default / local-stateful-classic - Profiling is setup and data is loaded - Admin user
• [job] [logs] Scout Lane #7 - stateful-classic / default / local-stateful-classic - Profiling is setup and data is loaded - Viewer user

Metrics [docs]

✅ unchanged

History

• 💔 Build #438877 failed 9dd6f1f
• 💔 Build #438678 failed e51e3ad

cc @csr