Unruly: Include GPID in request payload

[zxPhoenix]

🔧 Type of changes

• new bid adapter
• bid adapter update
• new feature
• new analytics adapter
• new module
• module update
• bugfix
• documentation
• configuration
• dependency update
• tech debt (test coverage, refactorings, etc.)

✨ What's the context?

Make Unruly's PBS adapter sending the GPID to the Unruly endpoint. [Issue #4252]

🧠 Rationale behind the change

Why did you choose to make these changes? Were there any trade-offs you had to consider?

🔎 New Bid Adapter Checklist

• verify email contact works
• NO fully dynamic hostnames
• geographic host parameters are NOT required
• direct use of HTTP is prohibited - implement an existing Bidder interface that will do all the job
• if the ORTB is just forwarded to the endpoint, use the generic adapter - define the new adapter as the alias of the generic adapter
• cover an adapter configuration with an integration test

🧪 Test plan

Unit tests are updated
Manual testing is done

🏎 Quality check

• Are your changes following our code style guidelines?
• Are there any breaking changes in your code?
• Does your test coverage exceed 90%?
• Are there any erroneous console logs, debuggers or leftover code in your changes?

[AntoxaAntoxic]

I don't understand why the bidder has to parse the imp.ext while it should be passing through as-is, so I suggest the following approach

    @Override
    public Result<List<HttpRequest<BidRequest>>> makeHttpRequests(BidRequest request) {
        final List<HttpRequest<BidRequest>> httpRequests = request.getImp().stream()
                .map(this::modifyImp)
                .map(imp -> createSingleRequest(imp, request))
                .toList();

        return Result.withValues(httpRequests);
    }

    private Imp modifyImp(Imp imp) {
        final ObjectNode impExt = imp.getExt();
        final ObjectNode modifiedImpExt = mapper.mapper().createObjectNode();
        modifiedImpExt.set("bidder", impExt.get("bidder"));
        modifiedImpExt.set("gpid", impExt.get("gpid"));
        return imp.toBuilder().ext(modifiedImpExt).build();
    }

    private HttpRequest<BidRequest> createSingleRequest(Imp imp, BidRequest request) {
        final BidRequest outgoingRequest = request.toBuilder().imp(Collections.singletonList(imp)).build();
        return BidderUtil.defaultRequest(outgoingRequest, endpointUrl, mapper);
    }

Also don't forget to clean up unused constants and classes