Use factory function for publisher creation in trollstalker and switch to Watchdog

[mraspaud]

This PR uses factory function for publisher creation in trollstalker and switches it to Watchdog

[coveralls]

Pull Request Test Coverage Report for Build 7871571797

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 0.0%

---

Totals
Change from base Build 7828186224:	0.0%
Covered Lines:	0
Relevant Lines:	0

---

💛 - Coveralls

[codecov]

Codecov Report

Attention: 37 lines in your changes are missing coverage. Please review.

Comparison is base (7965e59) 90.76% compared to head (ed449f1) 91.23%.
Report is 2 commits behind head on main.

❗ Current head ed449f1 differs from pull request most recent head 87045bc. Consider uploading reports for the commit 87045bc to get more accurate results

Files	Patch %	Lines
pytroll_collectors/trollstalker.py	77.43%	37 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #152      +/-   ##
==========================================
+ Coverage   90.76%   91.23%   +0.46%     
==========================================
  Files          32       32              
  Lines        4420     4416       -4     
==========================================
+ Hits         4012     4029      +17     
+ Misses        408      387      -21     

Flag	Coverage Δ
unittests	91.23% <82.21%> (+0.46%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[mraspaud]

The blacklisting of watchdog 4.0.0 is because of a bug solved in: gorakhargosh/watchdog#1032

[pnuu]

LGTM