[473] - Register ECT Flow - fetch TRS data

[TobyRet]

Ticket

https://github.com/DFE-Digital/register-early-career-teachers/issues/473

Changes

• Find an ECT record in TRS that matches a TRN and date of birth entered by a school user.
• Display the name associated with the TRS record so that the user can confirm the right person has been found.
• Add magic 'credentials' so that the team can get proceed through the find ECT step on dev environment

Video

https://github.com/user-attachments/assets/4c7fa656-37ba-413d-9570-53dea8e05afb

[github-actions[bot]]

Review app deployed to https://cpd-ec2-review-605-web.test.teacherservices.cloud

[github-actions[bot]]

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