docs(redirects): add /docs/sdk/python/sdk-v4 -> observability overview (#2917)

[mvanhorn]

Closes #2917.

Adds a redirect for /docs/sdk/python/sdk-v4 to /docs/observability/sdk/overview, matching the existing sibling entry for /docs/sdk/python/sdk-v3 in lib/redirects.js. The legacy URL now resolves to the same overview page instead of 404'ing.

Change Type

• Documentation (redirect entry)

Verification

• Diff is the single-line entry inserted alphabetically next to the existing sdk-v3 redirect, no surrounding edits.
• Same redirect target as sdk-v3, sdk/python/example, and sdk/python/low-level-sdk — consistent with the rest of the python SDK section in mainDocsReorder202507.

Greptile Summary

This PR adds a single redirect entry mapping the legacy /docs/sdk/python/sdk-v4 URL to /docs/observability/sdk/overview, fixing a 404 for that path.

• The redirect is inserted alphabetically alongside its sibling entries (sdk-v3, python/example, python/low-level-sdk) in the mainDocsReorder202507 array, and the destination page (content/docs/observability/sdk/overview.mdx) exists.
• The change is consistent with the existing redirect pattern in the file and requires no further adjustments.

Confidence Score: 5/5

This is a one-line, additive redirect entry with a verified destination page — safe to merge as-is.

The added entry follows the exact same pattern as the three adjacent python SDK redirects, the destination page exists on disk, and nothing else in the file is touched.

No files require special attention.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["/docs/sdk/python/sdk-v4 (legacy)"] -->|redirect via mainDocsReorder202507| B["/docs/observability/sdk/overview"]
    C["/docs/sdk/python/sdk-v3 (legacy)"] -->|redirect| B
    D["/docs/sdk/python/example (legacy)"] -->|redirect| B
    E["/docs/sdk/python/low-level-sdk (legacy)"] -->|redirect| B
    B --> F["content/docs/observability/sdk/overview.mdx"]

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