[browser][WBT] - make WBT test schedule helix jobs in parallel

[pavelsavara]

We are blocking with Waiting for completion before we do another Sent Helix Job

Log

2025-08-19T15:20:05.6014632Z   Sent Helix Job; see work items at https://helix.dot.net/api/jobs/97e4185d-8c10-4409-b00c-b829231fa6eb/workitems?api-version=2019-06-17
2025-08-19T15:20:05.6098356Z   Sent Helix Job; see work items at https://helix.dot.net/api/jobs/fde84fa8-f5e9-4683-abc0-66c3fd585a8a/workitems?api-version=2019-06-17
2025-08-19T15:20:06.6234073Z   Waiting for completion of job 97e4185d-8c10-4409-b00c-b829231fa6eb on (Ubuntu.2204.Amd64)Ubuntu.2204.Amd64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-22.04-helix-webassembly (Details: https://helix.dot.net/api/jobs/97e4185d-8c10-4409-b00c-b829231fa6eb/details?api-version=2019-06-17 )
2025-08-19T15:20:06.6245901Z   Waiting for completion of job fde84fa8-f5e9-4683-abc0-66c3fd585a8a on (Ubuntu.2204.Amd64)Ubuntu.2204.Amd64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-22.04-helix-webassembly (Details: https://helix.dot.net/api/jobs/fde84fa8-f5e9-4683-abc0-66c3fd585a8a/details?api-version=2019-06-17 )
2025-08-19T15:20:23.8362601Z   Sent Helix Job; see work items at https://helix.dot.net/api/jobs/1c51e90d-37df-419c-83bf-83ee602694fd/workitems?api-version=2019-06-17
2025-08-19T15:20:24.1151553Z   Sent Helix Job; see work items at https://helix.dot.net/api/jobs/dbd90be1-c62a-433b-bef1-9ba5695bd3fc/workitems?api-version=2019-06-17
2025-08-19T15:20:24.8479508Z   Waiting for completion of job 1c51e90d-37df-419c-83bf-83ee602694fd on (Ubuntu.2204.Amd64)Ubuntu.2204.Amd64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-22.04-helix-webassembly (Details: https://helix.dot.net/api/jobs/1c51e90d-37df-419c-83bf-83ee602694fd/details?api-version=2019-06-17 )
2025-08-19T15:20:25.1241346Z   Waiting for completion of job dbd90be1-c62a-433b-bef1-9ba5695bd3fc on (Ubuntu.2204.Amd64)Ubuntu.2204.Amd64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-22.04-helix-webassembly (Details: https://helix.dot.net/api/jobs/dbd90be1-c62a-433b-bef1-9ba5695bd3fc/details?api-version=2019-06-17 )
2025-08-19T15:53:51.4202661Z   Job 97e4185d-8c10-4409-b00c-b829231fa6eb on (Ubuntu.2204.Amd64)Ubuntu.2204.Amd64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-22.04-helix-webassembly is completed with 2 finished work items.
2025-08-19T15:53:52.2879851Z   Sending Job to (Ubuntu.2204.Amd64)Ubuntu.2204.Amd64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-22.04-helix-webassembly...
2025-08-19T15:53:52.9979427Z   Sent Helix Job; see work items at https://helix.dot.net/api/jobs/04ccb692-e750-4241-8727-6897ffccdd62/workitems?api-version=2019-06-17
2025-08-19T15:53:54.0014324Z   Waiting for completion of job 04ccb692-e750-4241-8727-6897ffccdd62 on (Ubuntu.2204.Amd64)Ubuntu.2204.Amd64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-22.04-helix-webassembly (Details: https://helix.dot.net/api/jobs/04ccb692-e750-4241-8727-6897ffccdd62/details?api-version=2019-06-17 )
2025-08-19T15:55:11.5750817Z   Job fde84fa8-f5e9-4683-abc0-66c3fd585a8a on (Ubuntu.2204.Amd64)Ubuntu.2204.Amd64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-22.04-helix-webassembly is completed with 2 finished work items.
2025-08-19T16:07:57.3592757Z   Sending Job to (Ubuntu.2204.Amd64)Ubuntu.2204.Amd64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-22.04-helix-webassembly...
2025-08-19T16:07:58.2240029Z   Sent Helix Job; see work items at https://helix.dot.net/api/jobs/f03f84c7-9a1c-4db9-9328-d34a61cf7389/workitems?api-version=2019-06-17
2025-08-19T16:07:59.2271142Z   Waiting for completion of job f03f84c7-9a1c-4db9-9328-d34a61cf7389 on (Ubuntu.2204.Amd64)Ubuntu.2204.Amd64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-22.04-helix-webassembly (Details: https://helix.dot.net/api/jobs/f03f84c7-9a1c-4db9-9328-d34a61cf7389/details?api-version=2019-06-17 )
2025-08-19T16:09:51.9687189Z   Job 1c51e90d-37df-419c-83bf-83ee602694fd on (Ubuntu.2204.Amd64)Ubuntu.2204.Amd64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-22.04-helix-webassembly is completed with 52 finished work items.

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Tagging subscribers to 'arch-wasm': @lewing
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[akoeplinger]

From the SendToHelix.binlog.zip we can see that msbuild schedules the send tasks sequentially:

[akoeplinger]

/cc @maraf