ImproveDigital: Remove placementKey & addtlconsent parsing

[ishihanvcs]

placementKey bidder param and addtlconsent parsing logic removed.

[github-actions[bot]]

Code coverage summary

Note:

• Prebid team doesn't anticipate tests covering code paths that might result in marshal and unmarshal errors

• Coverage summary encompasses all commits leading up to the latest one, 59dd9861be1b087eff5cc02ad0760f8f3be71492

  improvedigital

  Refer here for heat map coverage report

  github.com/prebid/prebid-server/v2/adapters/improvedigital/improvedigital.go:46:    MakeRequests            87.5%
  github.com/prebid/prebid-server/v2/adapters/improvedigital/improvedigital.go:63:    makeRequest         83.3%
  github.com/prebid/prebid-server/v2/adapters/improvedigital/improvedigital.go:93:    MakeBids            97.2%
  github.com/prebid/prebid-server/v2/adapters/improvedigital/improvedigital.go:168:   Builder             100.0%
  github.com/prebid/prebid-server/v2/adapters/improvedigital/improvedigital.go:175:   getBidType          100.0%
  github.com/prebid/prebid-server/v2/adapters/improvedigital/improvedigital.go:227:   isMultiFormatImp        100.0%
  github.com/prebid/prebid-server/v2/adapters/improvedigital/improvedigital.go:244:   getImpExtWithRewardedInventory  81.2%
  github.com/prebid/prebid-server/v2/adapters/improvedigital/improvedigital.go:273:   buildEndpointURL        100.0%
  total:                                          (statements)            93.7%
  

[ishihanvcs]

Hello @gargcreation1992: Can you expedite the merge of this PR please? After we get this merged here, we'll need to send a PR for the same changes in PBS Java, which is becoming pretty urgent for us.

TIA.