[core-rest-pipeline] Make FetchClient the default browser httpclient

[joheredi]

Currently, we are blocked on this by Playback tests as the recorder is tightly coupled with xhr. Once the SDKs that depend on CoreV2 are migrated to the new recorder we should be able to make the switch. This is a list of the SDKs that need to be migrated:

@joheredi

• ./sdk/documenttranslator/ai-document-translator-rest/package.json (.pipeline) - [document translator] Migrate to new recorder #20132
• ./sdk/tables/data-tables/package.json (client.pipeline)
• ./sdk/synapse/synapse-artifacts/package.json (client.pipeline) - [Artifacts] Update Synapse Artifacts to new recorder #20124
• ./sdk/synapse/synapse-access-control-rest/package.json (client.pipeline) - [Synapse Access Control] Migrating to the new Recorder #20153

@timovv

• ./sdk/containerregistry/container-registry/package.json (Pipeline = client["client"].pipeline)
• ./sdk/textanalytics/ai-text-analytics/package.json (client["client"].pipeline)
• ./sdk/iot/iot-modelsrepository/package.json (no recorder - remove dependency): [iot-modelsrepository] Remove unnecesary dependency on recorder #20150
• ./sdk/videoanalyzer/video-analyzer-edge/package.json (no recorder - remove dependency): does not depend on recorder
• ./sdk/remoterendering/mixed-reality-remote-rendering/package.json (client["client"].pipeline)

@JonathanCrd

• ./sdk/monitor/monitor-query/package.json (metricsQueryClient["_metricsClient"].pipeline) [Monitor-Query] Update monitor-query to use new recorder #20178
• ./sdk/purview/purview-account-rest/package.json (.pipeline) Deprecated
• ./sdk/purview/purview-administration-rest/package.json (.pipeline) [Purview] Update purview-administration to use new recorder #20352
• ./sdk/purview/purview-catalog-rest/package.json (.pipeline) [Purview] Update purview-catalog-rest to use new recorder #20366
• ./sdk/purview/purview-scanning-rest/package.json (.pipeline) Purview scanning migration #20350

@HarshaNalluru

• ./sdk/formrecognizer/ai-form-recognizer/package.json (client["_restClient"].pipeline) - [Form Recognizer] Migrate tests to the new recorder #20264
• ./sdk/eventgrid/eventgrid/package.json (client["client"].pipeline) - [Event Grid] Migrate tests to the new recorder #20273
• ./sdk/communication/communication-chat/package.json (Pipeline = chatClient["client"].pipeline) - [Communication Chat] Migrate communication-chat tests to the new recorder #20278
• ./sdk/search/search-documents/package.json (searchClient["client"].pipeline) [Search Documents] Migrating search-documents to the new recorder #20125
• ./sdk/schemaregistry/schema-registry/package.json (Done ✅)
• ./sdk/attestation/attestation/package.json (Pipeline = client["_client"].pipeline) - [Attestation] Update attestation to use the new recorder #20128

Misc

• ./sdk/web-pubsub/web-pubsub/package.json (doesn't provide the pipeline - postpone) Migrate web-pubsub to new recorder #20496
• ./sdk/identity/identity/package.json (will be handled separately - @sadasant is looking) Migrate Identity to new recorder #20497
• ./sdk/confidentialledger/confidential-ledger-rest/package.json (Pipeline = client.pipeline)(Postponed) Migrate Confidential Ledger tests to new recorder #20495

/cc: @jeremymeng @HarshaNalluru @timovv @JonathanCrd