fix(cloudflare): use softerror on internal server error with api

[vishuvenu]

Description

Updates the Cloudflare provider to raise SoftError on 5xx status code while interacting with Cloudflare API

Fixes #4315

Checklist

• Unit tests updated
• End user documentation updated - None Needed

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[mloiseleur]

/ok-to-test

[ebachle]

@mloiseleur would you be able to take a look at this one. Looks like tests are happy.

[mloiseleur]

/retitle fix(cloudflare): use softerror on internal server error with api

[mloiseleur]

/lgtm
/assign @Raffo