[Discover] Set to loading state when switching data views

[kertal]

Summary

Attempt to resolve #201744

Checklist

Check the PR satisfies following conditions.

Reviewers should verify this PR satisfies this list as well.

• Any text added follows EUI's writing guidelines, uses sentence case text and includes i18n support
• Documentation was added for features that require explanation or tutorials
• Unit or functional tests were updated or added to match the most common scenarios
• If a plugin configuration key changed, check if it needs to be allowlisted in the cloud and added to the docker list
• This was checked for breaking HTTP API changes, and any breaking changes have been approved by the breaking-change committee. The release_note:breaking label should be applied in these situations.
• Flaky Test Runner was used on any tests changed
• The PR description includes the appropriate Release Notes section, and the correct release_note:* label is applied per the guidelines

Identify risks

Does this PR introduce any risks? For example, consider risks like hard to test bugs, performance regression, potential of data loss.

Describe the risk, its severity, and mitigation for each identified risk. Invite stakeholders and evaluate how to proceed before merging.

• See some risk examples
• ...

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[kibanamachine]

Flaky Test Runner Stats

🟠 Some tests failed. - kibana-flaky-test-suite-runner#7518

[❌] test/functional/apps/management/config.ts: 0/25 tests passed.

see run history

[elasticmachine]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: a0c284f

Failed CI Steps

• Jest Tests #1
• Jest Tests #9

Test Failures

• [job] [logs] Jest Tests #9 / AgentStatusFilter Shows tour and inactive count if first time seeing newly inactive agents
• [job] [logs] Jest Tests #1 / FilterPopover renders empty label correctly

Metrics [docs]

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
discover	810.1KB	810.1KB	+16.0B

cc @kertal

[kibanamachine]

Flaky Test Runner Stats

🎉 All tests passed! - kibana-flaky-test-suite-runner#7544

[✅] x-pack/test_serverless/functional/test_suites/security/config.context_awareness.ts: 25/25 tests passed.

see run history

[kibanamachine]

Flaky Test Runner Stats

🎉 All tests passed! - kibana-flaky-test-suite-runner#7545

[✅] x-pack/test_serverless/functional/test_suites/security/config.context_awareness.ts: 25/25 tests passed.

see run history