[w3c/payment-request] Deprecate allowpaymentrequest attribute (#928)

closes #925 

The following tasks have been completed:

 * [X] Confirmed there are no ReSpec errors/warnings.
 * [ ] Modified Web platform tests (link)
 * [ ] Modified MDN Docs (link)
 * [ ] Has undergone security/privacy review (link)
 
Implementation commitment:

 * [X] Safari - Never implemented
 * [ ] Chrome (link to issue)
 * [X] Firefox - never shipped. 
 * [ ] Edge (public signal)

Optional, impact on Payment Handler spec?
None. 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/928

-- Commit Summary --

  * Deprecate allowpaymentrequest attribute

-- File Changes --

    M index.html (50)

-- Patch Links --

https://github.com/w3c/payment-request/pull/928.patch
https://github.com/w3c/payment-request/pull/928.diff

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