Prepare 2.5.0

[ShellyGarion]

Prepare Qiskit 2.5 final release

AI/LLM disclosure

• I didn't use LLM tooling, or only used it privately.
• I used the following tool to help write this PR description:
• I used the following tool to generate or modify code: we'll use Bob and/or Claude and/or Copilot for the release notes

[qiskit-bot]

One or more of the following people are relevant to this code:

• @Qiskit/terra-core