tines: make email address optional and add note

[efd6]

What does this PR do?

Makes the email address configuration field optional; v13+ of self-hosted instances and all cloud instances do not require it and so it would be confusing. Do leave it though since there may be pre v13 users, but add a note with a link to the Tines auth documentation.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

Author's Checklist

• [ ]

How to test this PR locally

Related issues

• Closes [Tines] Remove email account field #5421

Screenshots

[elasticmachine]

💚 Build Succeeded

the below badges are clickable and redirect to their specific view in the CI or DOCS

Expand to view the summary

Build stats

• Start Time: 2023-03-06T22:25:32.428+0000

• Duration: 15 min 3 sec

Test stats 🧪

Test	Results
Failed	0
Passed	12
Skipped	0
Total	12

🤖 GitHub comments

Expand to view the GitHub comments

To re-run your PR in the CI, just comment with:

• /test : Re-trigger the build.

[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (2/2)	💚
Files	100.0% (2/2)	💚
Classes	100.0% (2/2)	💚
Methods	91.304% (21/23)	👍 66.304
Lines	82.474% (160/194)	👎 -17.526
Conditionals	100.0% (0/0)	💚

[elasticmachine]

Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[bhapas]

LGTM

[elasticmachine]

Package tines - 0.0.3 containing this change is available at https://epr.elastic.co/search?package=tines