fix: use v3 EDR management endpoints in Bruno collection

[yamisukii]

What this PR changes/adds

This fixes the EDR-related Bruno requests for the MVD release/0.17.0 flow.

The Bruno collection currently uses the v4 management API for EDR endpoints:

• /api/mgmt/v4/edrs/request
• /api/mgmt/v4/edrs/{transferProcessId}/dataaddress

However, the EDR DataAddress endpoint is available under the v3 management API:

• /api/mgmt/v3/edrs/{transferProcessId}/dataaddress

This PR updates the affected Bruno requests and README documentation accordingly.

Why it does that

In the current flow, the transfer process can reach STARTED successfully and EDR metadata is stored in the consumer controlplane database, but the v4 EDR endpoint returns 404 Not Found.

Using the v3 EDR endpoint returns the expected DataAddress response.

Verified locally with Podman + KinD:

curl -i -X GET "http://127.0.0.1/api/mgmt/v3/edrs/<transferProcessId>/dataaddress" \
  -H "Host: cp.consumer.localhost" \
  -H "X-Api-Key: password"

Who will sponsor this feature?

N/A - bug fix.

Linked Issue: Closes #604