feat: Linear node overhaul

[Joffcom]

Summary

Overhaul the Linear and Linear Trigger nodes

• Both nodes versioned
• Moved credential test to credenital file
• Trigger node can now listen for All Public Teams
• Trigger node now supports Issue Attachments

Related Linear tickets, Github issues, and Community forum posts

https://linear.app/n8n/issue/NODE-2149/linear-node-overhaul

Review / Merge checklist

• PR title and summary are descriptive. (conventions)
• Docs updated or follow-up ticket created.
• Tests included.
• PR Labeled with release/backport (if the PR is an urgent fix that needs to be backported)

[codecov]

Codecov Report

Attention: Patch coverage is 33.17757% with 143 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...nodes-base/nodes/Linear/v2/LinearTriggerV2.node.ts	0.00%	49 Missing ⚠️
...nodes-base/nodes/Linear/v1/LinearTriggerV1.node.ts	0.00%	48 Missing ⚠️
...ckages/nodes-base/nodes/Linear/v1/LinearV1.node.ts	63.36%	36 Missing and 1 partial ⚠️
...ages/nodes-base/nodes/Linear/LinearTrigger.node.ts	0.00%	8 Missing ⚠️
...es/nodes-base/credentials/LinearApi.credentials.ts	0.00%	1 Missing ⚠️

📢 Thoughts on this report? Let us know!

[Joffcom]

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