Add ability to create PipelineRun from YAML [codemirror]

[marniks7]

Changes

Add ability to create PipelineRun from YAML

1. YAML Mode button on Create Pipeline Page
   
2. YAML Mode
   
3. New page part is accessible by direct url #/pipelineruns/create?mode=yaml
4. On create: Validation for non specified pipelinerun
5. On create: Validation for not specified namespace (namespace in top right corner is ignored even if it is not 'all namespaces`)
6. On create: Error handling for backend error response
7. On create: Validation for non parsed yaml

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• Docs included if any changes are user facing
• Tests included if any functionality added or changed
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  functionality, content, code)
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Release Notes

Feature: Add ability to create PipelineRun from YAML

[tekton-robot]

Hi @marniks7. Thanks for your PR.

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[marniks7]

/kind feature

[marniks7]

/assign @AlanGreene

[AlanGreene]

/ok-to-test

[AlanGreene]

This is looking great @marniks7, thanks for switching to the new editor. I've left a few comments, mostly related to naming / consistency, nothing too major.

I've also left a comment about the CSP value and a pointer to where it needs to be configured for the production build.

Let me know if you have any questions.

[AlanGreene]

I found a bit of a styling issue in dark mode, the colour contrast for some of the YAML tokens is very low rendering them practically invisible.

Here's the text highlighted:

We should load a dark theme to handle this. In future we will likely roll our own theme to match the rest of the app but for now one of the defaults will be sufficient.

Otherwise this looks great 👍 Thanks for all your hard work so far and quick turnaround on feedback, it's very much appreciated.

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AlanGreene

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[marniks7]

Changed to theme=dark. Tested in both light and dark tekton themes - looks good.

[AlanGreene]

Thanks @marniks7
/lgtm