Move webhook type from int to string

[lunny]

As title.

[6543]

@lunny if you merge lunny#11 and resolve migration conflict it should be done

[lunny]

@6543 done.

[codecov-io]

Codecov Report

Merging #13664 (cd94b0d) into master (18712ea) will decrease coverage by 0.11%.
The diff coverage is 28.12%.

@@            Coverage Diff             @@
##           master   #13664      +/-   ##
==========================================
- Coverage   42.25%   42.14%   -0.12%     
==========================================
  Files         708      709       +1     
  Lines       77127    77118       -9     
==========================================
- Hits        32591    32500      -91     
- Misses      39169    39273     +104     
+ Partials     5367     5345      -22     

Impacted Files	Coverage Δ
models/migrations/migrations.go	2.44% <ø> (ø)
models/migrations/v161.go	0.00% <0.00%> (ø)
models/webhook.go	68.97% <ø> (+0.81%)	⬆️
modules/convert/convert.go	74.89% <0.00%> (ø)
routers/api/v1/repo/hook.go	26.41% <ø> (ø)
routers/api/v1/utils/hook.go	0.00% <0.00%> (ø)
routers/init.go	50.40% <ø> (ø)
routers/repo/webhook.go	1.04% <0.00%> (ø)
services/webhook/deliver.go	46.87% <0.00%> (ø)
services/webhook/dingtalk.go	6.81% <ø> (ø)
... and 20 more

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[6543]

🚀

[jolheiser]

This migration needs to be updated to convert the webhook model as well.
I'm not sure if more code needs to be changed as well from a cursory glance.

gitea/models/webhook.go

Line 115 in abb9cff

HookTaskType HookTaskType