Support more than one header in External Channel

[jcbalmeida]

Solves the issue https://github.com/rapidpro/rapidpro/issues/1547

Obs.: It need nyaruka/courier#386 to work

[codecov]

Codecov Report

Merging #3589 (ff889a1) into main (88b9602) will not change coverage.
The diff coverage is 100.00%.

❗ Current head ff889a1 differs from pull request most recent head 6a417b5. Consider uploading reports for the commit 6a417b5 to get more accurate results

@@            Coverage Diff            @@
##              main     #3589   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          445       446    +1     
  Lines        25881     25885    +4     
=========================================
+ Hits         25881     25885    +4     

Impacted Files	Coverage Δ
temba/channels/migrations/0136_external_headers.py	100.00% <100.00%> (ø)
temba/channels/types/external/type.py	100.00% <100.00%> (ø)
temba/channels/types/external/views.py	100.00% <100.00%> (ø)

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[matmsa27]

Hi @rowanseymour , any news on this and the courier PR? Thanks

[rowanseymour]

@matmsa27 just want small tweak re nyaruka/courier#386 (review) as we'll be deploying the courier side before we deploy this RP bit

[matmsa27]

Nice, thanks @rowanseymour , I saw here that courier was merged. Please, any adjust here that you want on this PR, we will be available to fix ASAP.

[rowanseymour]

Ok so our general rules for data migrations are..

1. Just print a summary at the end like 123 channels updated, 5 ignored
2. Write a unit test using MigrationTest (e.g. see

   rapidpro/temba/msgs/tests.py

   Line 2847 in ecc9bc2

   class ScheduledBroadcastCleanupTest(MigrationTest):

   )
3. Don't worry about reverse-ability

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[github-actions]

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