[cloudflare] bugfix interval

[leehinman]

What does this PR do?

Fix interval logic so interval can be as small as 1s instead of
2m. This is necessary if there are large volumes of data.

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.

How to test this PR locally

cd packages/cloudflare
elasstic-package clean && elastic-package check
elastic-package stack up -d
eval "$(elastic-package stack shellinit)"
elastic-package test

Related issues

• Closes [cloudflare] support intervals smaller than 2 minutes #2705

[elasticmachine]

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

[elasticmachine]

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Build stats

• Start Time: 2022-03-08T18:22:53.443+0000

• Duration: 13 min 24 sec

Test stats 🧪

Test	Results
Failed	0
Passed	96
Skipped	0
Total	96

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