airbyte-ci: send publish failures to a dedicated slack channel

[alafanechere]

What

Closes #42522
Closes #42521

• Send connector specific publish failure messages from airbyte-ci to #connector-publish-failures
• Send workflow failures to #connector-publish-failures (this will catch transient workflow failures when airbyte-ci can't start)
• Continue sending all messages to #connector-publish-updates

How

• Do not expose a custom option to define which slack channel to send messages to
• Hardcode the list of targeted slack channels
• Declare a PipelineContext.get_slack_channels method to return the list of channels to send a message to.
• Implement a PublishContext.get_slack_channels method which returns targeted channels according to pipeline state
• Make send_slack_webhook accept a list of channels to send a message to

Example

Can this PR be safely reverted and rolled back?

• YES 💚
• NO ❌

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[alafanechere]

• airbyte-ci: send publish failures to a dedicated slack channel #42849 👈
• master

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[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: airbyte-ci/connectors/pipelines/pipelines/airbyte_ci/connectors/context.py

Function	Unhandled Issue
__init__	ValueError: too many values to unpack (expected 2) pipelines.models.contexts.pipeline_context in <listcom... Event Count: 3

📄 File: airbyte-ci/connectors/pipelines/pipelines/models/contexts/pipeline_context.py (Click to Expand)

Function	Unhandled Issue
__init__	ValueError: too many values to unpack (expected 2) pipelines.models.contexts.pipeline_context in <listcom... Event Count: 3

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[clnoll]

Looks great @alafanechere!