Make status message as templates

[chmouel]

Status message was getting too complicated when managing with fmt.Sprintf and it was getting hard to maintain, changing this to use a more flexible go templates.

And add tkn binary URL for download links in the message

• how it look like on webhook method (gitea):
  

• on Github checks run
  

Changes

Submitter Checklist

• 📝 A good commit message is important for other reviewers to understand the context of your change. Please refer to How to Write a Git Commit Message for more details how to write beautiful commit messages. We rather have the commit message in the PR body and the commit message instead of an external website.
• ♽ Run make test before submitting a PR (ie: with pre-commit, no need to waste CPU cycle on CI. (or even better install pre-commit and do pre-commit install in the root of this repo).
• ✨ We heavily rely on linters to get our code clean and consistent, please ensure that you have run make lint before submitting a PR. The markdownlint error can get usually fixed by running make fix-markdownlint (make sure it's installed first)
• 📖 If you are adding a user facing feature or make a change of the behavior, please verify that you have documented it
• 🧪 100% coverage is not a target but most of the time we would rather have a unit test if you make a code change.
• 🎁 If that's something that is possible to do please ensure to check if we can add a e2e test.
• 🔎 If there is a flakiness in the CI tests then don't necessary ignore it, better get the flakyness fixed before merging or if that's not possible there is a good reason to bypass it. (token rate limitation may be a good reason to skip).

[chmouel]

we would need to set this to the opc url in downstream @piyush-garg

[codecov]

Codecov Report

Attention: 19 lines in your changes are missing coverage. Please review.

Comparison is base (c0fd155) 61.62% compared to head (830f6e6) 61.58%.
Report is 1 commits behind head on main.

❗ Current head 830f6e6 differs from pull request most recent head a064b4f. Consider uploading reports for the commit a064b4f to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1455      +/-   ##
==========================================
- Coverage   61.62%   61.58%   -0.05%     
==========================================
  Files         136      137       +1     
  Lines       10255    10277      +22     
==========================================
+ Hits         6320     6329       +9     
- Misses       3424     3435      +11     
- Partials      511      513       +2     

Files	Coverage Δ
pkg/formatting/starting.go	100.00% <100.00%> (ø)
pkg/params/settings/config.go	59.05% <ø> (ø)
pkg/pipelineascode/pipelineascode.go	64.77% <62.50%> (-2.10%)	⬇️
pkg/reconciler/reconciler.go	19.76% <0.00%> (-0.84%)	⬇️

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[piyush-garg]

/lgtm