Remove welcomebot from boilerplate

[eapolinario]

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- Use #patch, #minor or #major in the pull-request title to bump the corresponding version. Otherwise, the patch version
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TL;DR

Please replace this text with a description of what this PR accomplishes.

Type

• Bug Fix
• Feature
• Plugin

Are all requirements met?

• Code completed
• Smoke tested
• Unit tests added
• Code documentation added
• Any pending items have an associated Issue

Complete description

How did you fix the bug, make the feature etc. Link to any design docs etc

Tracking Issue

flyteorg/flyte#1963

fixes https://github.com/flyteorg/flyte/issues/

Follow-up issue

NA
OR
https://github.com/flyteorg/flyte/issues/

[codecov]

Codecov Report

Merging #375 (c758296) into master (7ddd993) will increase coverage by 1.34%.
The diff coverage is n/a.

❗ Current head c758296 differs from pull request most recent head 9f7aedd. Consider uploading reports for the commit 9f7aedd to get more accurate results

@@            Coverage Diff             @@
##           master     #375      +/-   ##
==========================================
+ Coverage   62.89%   64.23%   +1.34%     
==========================================
  Files         154      154              
  Lines       13029    10570    -2459     
==========================================
- Hits         8195     6790    -1405     
+ Misses       4221     3167    -1054     
  Partials      613      613              

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see 135 files with indirect coverage changes