Update Security Findings schema reference: add base_image, reachable-risk fields, severity-override metadata

[filipelteixeira]

What does this PR do?

Updates the public Security Findings schema reference page for this week's schema batch.

• Adds @container_image.base_image (a recursive container image; a base image may carry its own base_image) and @vulnerability.is_inherited_from_base_image. Source: https://github.com/DataDog/security-finding-schema/pull/226 Source: https://github.com/DataDog/security-finding-schema/pull/229
• Updates @risk_details.is_function_reachable.evidence.locations to the new ReachableLocation shape (adds last_detected_at, drops column_start, column_end, line_end, is_test_file, url), and adds is_supported and unreachable_at on the evidence object. Source: https://github.com/DataDog/security-finding-schema/pull/227
• Adds @workflow.severity_override.updated_by and updated_at. Source: https://github.com/DataDog/security-finding-schema/pull/228
• Removes @workflow.integrations.cases.linear_issue.team_id. Source: https://github.com/DataDog/security-finding-schema/pull/221

Note: crates.io (Ecosystem) is not enumerated on this reference page, so it produces no doc change.

⚠️ Reviewer note: this generated diff also removes the "## Linking to findings" prose section that exists on main. That section is not part of the schema batch. It should be restored before merge (the doc generator does not preserve that manually-added section).

Siblings PRs

https://github.com/DataDog/logs-backend/pull/141150
https://github.com/DataDog/web-ui/pull/319889
https://github.com/DataDog/dd-source/pull/469951

Generated by

Generated by the Security Finding Schema Tool.

cc @DataDog/k9-finding-schema-governance

[buraizu]

Left some feedback. Also, I'm not seeing these changes reflected in the build preview:
https://docs-staging.datadoghq.com/filipelteixeira/schema-update-0e00fb51/security/guide/findings-schema/

Do you happen to know if that's expected in this case?

[buraizu]

Suggested change

	<td><strong>Path:</strong> <code>@risk_details.is_function_reachable.evidence.unreachable_at</code><br>Timestamp in milliseconds (UTC) at which the finding will transition to unreachable if the vulnerable function has not been called.</td>
	<td><strong>Path:</strong> <code>@risk_details.is_function_reachable.evidence.unreachable_at</code><br>Timestamp in milliseconds (UTC) at which the finding transitions to an unreachable state if the vulnerable function is not called.</td>

[buraizu]

Looks like this section should be restored, per the reviewer note in the PR description:

⚠️ Reviewer note: this generated diff also removes the "## Linking to findings" prose section that exists on main. That section is not part of the schema batch. It should be restored before merge (the doc generator does not preserve that manually-added section).