[BEAM-13836] Fix the answers placeholders locations in the Python katas

[iht]

The Python katas placeholder locations were wrong after some tags were added to the code (see #16192).

This pull request puts the placeholders back in the right locations for the katas to work with the Edu plugin of PyCharm/IntelliJ.

It also adds the following changes:

• Uodate to Beam 2.36 and the lates version of pytz (required dependency for some tests)
• Add tags to some untagged katas ( the three katas in the Triggers section)
• Groom the test and code of the Triggers katas (to match the same style used in the rest of the katas)

ValidatesRunner compliance status (on master branch)

Lang	ULR	Dataflow	Flink	Samza	Spark	Twister2
Go	---					---
Java
Python	---					---
XLang						---

Examples testing status on various runners

Lang	ULR	Dataflow	Flink	Samza	Spark	Twister2
Go	---	---	---	---	---	---	---
Java	---		---	---	---	---	---
Python	---	---	---	---	---	---	---
XLang	---	---	---	---	---	---	---

Post-Commit SDK/Transform Integration Tests Status (on master branch)

Go	Java	Python

Pre-Commit Tests Status (on master branch)

---	Java	Python	Go	Website	Whitespace	Typescript
Non-portable
Portable	---			---	---	---

See .test-infra/jenkins/README for trigger phrase, status and link of all Jenkins jobs.

GitHub Actions Tests Status (on master branch)

See CI.md for more information about GitHub Actions CI.

[iht]

R: @pabloem

[pabloem]

thanks so much @iht LGTM

[aaltay]

Out of curiosity how do you calculate, verify these offset numbers? Is there a way to keep them automatically updated?

[iht]

If you use the Edu plugin, you have an option in the contextual menu to add an answer placeholder. There is more info here: https://plugins.jetbrains.com/plugin/10081-edutools/docs/framework-lessons-guide-for-educators.html#framework_lesson_placeholders

So what I did is removing the previous placeholders, then I created new ones with the same contents, but different locations.

For the katas to be edited "correctly", you have to use the Edu plugin to edit the code, using the "course" mode, and the answer placeholders are automatically updated too (https://plugins.jetbrains.com/plugin/10081-edutools/docs/educator-start-guide.html#create_tasks).

There is a minor caveat: IntelliJ removes the license header from the YAML files, so you have to re-add those again after you finish editing the code.