fix: Unsupported Slack API calls

[PuszekSE]

SUMMARY

Issue/29480 invalid slack operation

I've used very naive approach of simply replacing method calls for 'files_upload', since the method using it has already been marked for deprecation inside Superset.

TESTING INSTRUCTIONS

Setup Slack Token API-based notification using dashboard.
Actually send the notification, instead of receiving API deprecation response from Slack.

ADDITIONAL INFORMATION

• Has associated issue: fixes Slack Notification - deprecated API  #29480
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[github-actions]

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[rusackas]

Thanks for the PR! I think @eschutho is working on the same thing... hopefully we're not duplicating efforts. I've added her as a reviewer.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.68%. Comparing base (76d897e) to head (cff96ac).
Report is 436 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #29532       +/-   ##
===========================================
+ Coverage   60.48%   83.68%   +23.19%     
===========================================
  Files        1931      523     -1408     
  Lines       76236    37633    -38603     
  Branches     8568        0     -8568     
===========================================
- Hits        46114    31492    -14622     
+ Misses      28017     6141    -21876     
+ Partials     2105        0     -2105     

Flag	Coverage Δ
hive	49.10% <0.00%> (-0.06%)	⬇️
javascript	?
postgres	77.14% <100.00%> (?)
presto	53.70% <0.00%> (-0.10%)	⬇️
python	83.68% <100.00%> (+20.19%)	⬆️
sqlite	76.62% <100.00%> (?)
unit	59.67% <0.00%> (+2.04%)	⬆️

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[eschutho]

Hi, thanks @PuszekSE for the contribution! As @rusackas mentioned, I had a similar PR here but it turns out that the v2 api has a different schema, so I'm implementing another larger change based on the new flow here. I'll close this PR and you can track (and comment) on the current one.

[PuszekSE]

Thank you for the feedback!

[rusackas]

Thank you for the feedback!

Thank you for the PR! We appreciate this, and any other contribution you're willing to make to the project. Feel free to reach out on slack if you ever want to discuss other opportunities to do so!