Update logo in Elastic Package Registry integration

[mrodm]

What does this PR do?

Add the new Elastic Package Registry logo to be used as icon of the integration.

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

• New logo is shown in both integrations UI and in its own description

Related issues

• Relates package-registry observability integration package-registry#797

Screenshots

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Build stats

• Start Time: 2022-07-29T07:55:25.661+0000

• Duration: 15 min 17 sec

Test stats 🧪

Test	Results
Failed	0
Passed	5
Skipped	0
Total	5

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (1/1)	💚 3.046
Classes	100.0% (1/1)	💚 3.046
Methods	100.0% (8/8)	💚 10.629
Lines	100.0% (77/77)	💚 9.908
Conditionals	100.0% (0/0)	💚

[mtojek]

Actually, you can also replace the default favicon we're using in EPR :)

[jsoriano]

Nice icon! 🙂