fix: pass correct report_format

[eschutho]

SUMMARY

We were passing "TEXT" for all report_types and it was breaking dashboards which require a PNG report type. The result was that we were receiving emails with no image for dashboards.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

before:

after:

TESTING INSTRUCTIONS

create a report from a dashboard page and verify that the email has a png image in it.
unit tests are currently in review in a separate pr. Will update them to add this functionality.

ADDITIONAL INFORMATION

• Has associated issue:
• 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

[codecov]

Codecov Report

Merging #16306 (199fe9f) into master (7a284bb) will decrease coverage by 0.00%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##           master   #16306      +/-   ##
==========================================
- Coverage   76.65%   76.65%   -0.01%     
==========================================
  Files         999      999              
  Lines       53394    53397       +3     
  Branches     6817     6819       +2     
==========================================
+ Hits        40929    40931       +2     
- Misses      12228    12229       +1     
  Partials      237      237              

Flag	Coverage Δ
javascript	70.77% <87.50%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
...rset-frontend/src/components/ReportModal/index.tsx	73.46% <87.50%> (-0.22%)	⬇️

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[eschutho]

@betodealmeida if this looks good to you and passes CI, feel free to merge if you need it.

[betodealmeida]

Awesome!

[stevenuray]

🏷️ 2021.31.10

[stevenuray]

🏷️ 2021.31