[GH-982]: Added support for webhook of plugin version v2.x.x

[Kshitij-Katiyar]

Summary

• Added the endpoint to support the webhooks created for plugin version v2.x.x

Issue link

#982

What to test

-The webhook created for jira plugin version 2. x.x should be supported and working fine.

How to test

• Create a webhook using the readme from https://github.com/mattermost/mattermost-plugin-jira/tree/v2.4.0#step-2-configure-webhooks-in-jira.
• Create the subscription
• Change notifications should come from the jira side.

[codecov-commenter]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (6109662) 29.65% compared to head (20a12fa) 29.66%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #989   +/-   ##
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  Coverage   29.65%   29.66%           
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  Files          52       52           
  Lines        7792     7798    +6     
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+ Hits         2311     2313    +2     
- Misses       5285     5289    +4     
  Partials      196      196           

Files	Coverage Δ
server/http.go	70.64% <100.00%> (+0.59%)	⬆️

... and 2 files with indirect coverage changes

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[mickmister]

LGTM for the api/v2/webhook path, though we also need to support the /webhook path

[mickmister]

@Kshitij-Katiyar Have you tested the following permutations for this:

• /webhook
• /api/v2/webhook
• instance/INSTANCE_ID/webhook
• instance/INSTANCE_ID/api/v2/webhook

If so I think we can merge this

[Kshitij-Katiyar]

@Kshitij-Katiyar Have you tested the following permutations for this:

• /webhook
• /api/v2/webhook
• instance/INSTANCE_ID/webhook
• instance/INSTANCE_ID/api/v2/webhook

If so I think we can merge this

@mickmister I have tested for all 4 API endpoints and we are getting the notifications in the cases.