Allow templating in the `endpoint` parameter in the http client source

[konstantin-kornienko]

A note for the community

• Please vote on this issue by adding a 👍 reaction to the original issue to help the community and maintainers prioritize this request
• If you are interested in working on this issue or have submitted a pull request, please leave a comment

Use Cases

Some APIs require dynamic GET parameters.
For example, GitHub API support &createdAt=>2025-04-30T00:00:00 syntax to filter results based on the date.

It's not possible to send requests like this from the Vector's http client source.

Attempted Solutions

No response

Proposal

No response

References

No response

Version

No response

[benjamin-awd]

Should be resolved by https://github.com/vectordotdev/vector/pull/22706/files (only a working branch for now, unfortunately)