fix issue #49938: missing property in helm airbyte/value.yaml (helm v1.3.1)

[sc-yan]

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What

there is a somewhat "breaking" change introduced by this commit. https://github.com/airbytehq/airbyte-platform/commit/02e3c972338cc8a63364528d137ae52beec2f4a0 I'm not sure the context of this commit, but as far as I understand, global.serviceAccountName should be used across each services in airbyte. however, if the purpose is to let "workload-launcher" to use its own serviceaccount, then airbyte/values.yaml should be updated because this is where most end-users refer to since there is no changelog for helm charts.

How

to fix this issue https://github.com/airbytehq/airbyte/issues/49938

Recommended reading order

1. value.yaml

Can this PR be safely reverted and rolled back?

• [x] YES 💚
• [ ] NO ❌