[Anduril] "Defend for containers" updates and fixes

[mitodrummer]

What does this PR do?

• logo and screenshots added
• removed ecs.yml in favor of new "dynamic ecs" mapping feature
• agent template updated to match shape our cloud-defend config service expects.

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.

Screenshots

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• Start Time: 2023-01-19T03:57:17.402+0000

• Duration: 14 min 25 sec

Test stats 🧪

Test	Results
Failed	0
Passed	3
Skipped	0
Total	3

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (0/0)	💚
Files	100.0% (0/0)	💚 2.247
Classes	100.0% (0/0)	💚 2.247
Methods	28.571% (2/7)	👎 -63.056
Lines	100.0% (0/0)	💚 6.755
Conditionals	100.0% (0/0)	💚

[P1llus]

Adding a link to the tracking issue for ECS dynamic template testing so we have this PR as a reference: #5055

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Pinging @elastic/sec-linux-platform (Team:Security-Linux Platform)