[support-infra] Improve priority support

[oliviertassinari]

Summary 💡

This is a continuation of https://mui.zendesk.com/agent/tickets/12210. Ideas we could act on to improve the support experience:

• 1. Fix the casing to match the reset: mui/mui-x@8e46bfd
• 2. Update mui-x/.github/ISSUE_TEMPLATE/5.priority-support.yml to link to the plan https://mui.com/legal/technical-support-sla/#support-plans [core] Link the priority support page mui-x#10495 https://github.com/mui/mui-x/issues/new/choose
• 3. Get ride of https://docs.google.com/spreadsheets/d/1RNYabJOzAs4pzMN6WI0yAfeGXOqDiMU1t8TpqA1EPjE/edit?gid=0#gid=0. Replace it by 4.
• 4. Issue a special Support key, one that is meant to be kept private for all orders automatically. Today, developers have to use their order id, but it's too easy to usurp and guess.
• 5. Have the priority support key be visible in the license part of the store.
• 6. Update https://tools-public.mui.com/prod/pages/validateSupport to support this new key system
• 7. Update the "Bug report 🐛" & "Feature request 💄" template, e.g. https://github.com/mui/mui-x/issues/new?assignees=&labels=status%3A+waiting+for+maintainer%2Cbug+%F0%9F%90%9B&projects=&template=1.bug.yml to ask folks to verify their support, heading to https://tools-public.mui.com/prod/pages/validateSupport and using their above support key. If verified, then the right GitHub label is applied: support: pro standard, support: premium standard, support: priority. This would help ensure we provide the right level of support based on what people are entitled. We have a plan: Pro and plan: Premium label but these are for the features, not the support plan. We can have Pro level support on community features.

Maybe:

• 8. Merge "Pro plan: question ❔", "Premium plan: question ❔, and "Priority Support: SLA ⏰" into a single issue template, called "Paid support: question ❔". Using the same verification system as in 5. It doesn't seem to serve any purpose to have 3 different templates when we have 5 working well. We need a question template because it's unlikely that the community will help on Stack Overflow, and because it's part of the product purchased.

Motivation 🔦

The equivalent Notion Task https://www.notion.so/mui-org/Scale-priority-support-issue-with-GitHub-action-for-all-issues-36bb542ac417441294bf39e6a927f9ce

cc @michelengelen for context and @DanailH who worked on mui/mui-x#8928 before.

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[michelengelen]

@oliviertassinari mui/mui-x#10495