feat: add 'cos_account_id' output

[ocofaigh]

Description

add 'cos_account_id' output

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• [ ] Patch release (x.x.X)
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/run pipeline

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/run pipeline

[ocofaigh]

/run pipeline

[terraform-ibm-modules-ops]

:tada: This PR is included in version 8.12.0 :tada:

The release is available on:

• GitHub release
• v8.12.0

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