Add solarwinds observability credential

[Joffcom]

This is the docs for new credential only node found here: n8n-io/n8n#11805

API Token Docs: https://documentation.solarwinds.com/en/success_center/observability/content/settings/api-tokens.htm

Fields required

• URL
• API Token

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The PR has been merged and this credential will be available in 1.73.0

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[github-actions]

Overall readability score: 44.66 (🔴 -0.02)

File	Readability
solarwindsobservability.md	19.01 (-)

View detailed metrics

🟢 - Shows an increase in readability
🔴 - Shows a decrease in readability

File	Readability	FRE	GF	ARI	CLI	DCRS
solarwindsobservability.md	19.01	0	11.32	22	19	9.18
	-	-	-	-	-	-

Averages:

	Readability	FRE	GF	ARI	CLI	DCRS
Average	44.66	35.53	11.38	14.62	14.23	8.43
	🔴 -0.02	🔴 -0.03	🟢 +0	🔴 -0.01	🟢 +0	🟢 +0

View metric targets

Metric	Range	Ideal score
Flesch Reading Ease	100 (very easy read) to 0 (extremely difficult read)	60
Gunning Fog	6 (very easy read) to 17 (extremely difficult read)	8 or less
Auto. Read. Index	6 (very easy read) to 14 (extremely difficult read)	8 or less
Coleman Liau Index	6 (very easy read) to 17 (extremely difficult read)	8 or less
Dale-Chall Readability	4.9 (very easy read) to 9.9 (extremely difficult read)	6.9 or less

[imchairmanm]

Thanks for the PR @Joffcom. Just left a few formatting changes.