[ews] Add build step to Validate ChangeLog for commit-queue

[Aakash Jain]

Add build step to Validate ChangeLog. This step would be required for commit-queue, to validate whether the ChangeLog looks fine (i.e. doesn't contains OOPS, the reviewer name in 'Reviewed by XYZ' is a valid reviewer).

[Aakash Jain]

Created attachment 391409 [details]
Patch

[Aakash Jain]

Sample run: https://ews-build.webkit-uat.org/#/builders/26/builds/698

[Jonathan Bedard]

(In reply to Aakash Jain from comment #2)
> Sample run: https://ews-build.webkit-uat.org/#/builders/26/builds/698

Do you have a successful example?

[Aakash Jain]

(In reply to Jonathan Bedard from comment #3)
> Do you have a successful example?
https://ews-build.webkit-uat.org/#/builders/26/builds/735

[Aakash Jain]

Committed r257157: <https://trac.webkit.org/changeset/257157>

[Radar WebKit Bug Importer]

<rdar://problem/59679885>

[Aakash Jain]

This change seems to be working fine. e.g.:

ChangeLog missing Unreviewed/Reviewed-by text: https://ews-build.webkit.org/#/builders/28/builds/64

ChangeLog containing OOPS: https://ews-build.webkit.org/#/builders/28/builds/52