Draft some new admonitions

[lcawl]

This PR adds some admonitions for serverless- and ESS-specific admonitions:

• beta_ess
• beta_serverless
• dev_ess
• dev_serverless
• ga_serverless
• ga_stack
• ga_ess
• deprecated_ess
• deprecated_serverless
• discontinued_ess
• discontinued_serverless
• discontinued_stack
• coming_ess
• coming_serverless

The work similar to the existing admonitions, for example:

NOTE: The rubocop config file change works around the following make error:

lib/care_admonition/extension.rb:100:3: C: Metrics/MethodLength: Method has too many lines. [31/20]

TBD: Are there other combinations that we'll need (e.g. "ga_all" to have a single admonition that covers all contexts)?

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[leemthompo]

• I'd like a simple "Not available on serverless" tag too :)
• I guess we should s/Elastic Serverless/Elastic Cloud Serverless/g

[leemthompo]

@lcawl if you approve I can push a commit for my suggestions