Rubicon: Remove imp.ext.context references

[CTMBNara]

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[github-actions]

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, 0b4e673

rubicon

Refer here for heat map coverage report

github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:178:	resolveVideoSizeId			100.0%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:196:	appendTrackerToUrl			87.5%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:212:	Builder					100.0%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:223:	updateRequestTo26			92.3%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:248:	MakeRequests				81.3%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:565:	createImpsToExtMap			100.0%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:584:	prepareImpsToExtMap			100.0%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:603:	splitMultiFormatImp			61.5%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:640:	resolveBidFloor				100.0%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:648:	updateImpRpTargetWithFpdAttributes	80.4%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:739:	extractDfpAdUnitCode			100.0%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:747:	isNotKeyPathError			100.0%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:751:	addStringAttribute			100.0%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:755:	addStringArrayAttribute			100.0%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:759:	updateUserRpTargetWithFpdAttributes	70.0%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:789:	updateExtWithIabAttribute		100.0%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:798:	populateFirstPartyDataAttributes	92.9%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:826:	isStringArray				100.0%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:836:	isBoolArray				100.0%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:846:	convertToStringArray			100.0%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:857:	rawJSONToMap				100.0%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:865:	mapFromRawJSON				80.0%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:874:	getSegmentIdsToCopy			100.0%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:894:	contains				75.0%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:903:	isVideo					100.0%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:912:	isFullyPopulatedVideo			100.0%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:917:	resolveNativeObject			88.2%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:949:	setImpNative				82.4%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:978:	MakeBids				92.2%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:1078:	mapImpIdToCpmOverride			90.0%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:1096:	resolveAdm				87.5%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:1111:	cmpOverrideFromBidRequest		100.0%
github.com/prebid/prebid-server/v2/adapters/rubicon/rubicon.go:1120:	updateBidExtWithMetaNetworkId		82.4%
total:									(statements)				84.8%