feat(alerts): add support for cci polling frequency field in conditions

[gffuentes]

DO NOT MERGE YET

https://new-relic.atlassian.net/browse/NR-413526
Adds support for polling frequency - a new field on conditions that is part of CCI project

newrelic/terraform-provider-newrelic#2890

[codecov-commenter]

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[akane0915]

PollingFrequency should be nullable, right? Curious if we should leave off omitEmpty here.

[akane0915]

PollingFrequency is only for static conditions, but alertsNrqlConditionBaselineCreate does allow for pollingFrequency: null.

[gffuentes]

i fixed this - looks like create should allow null, but update should not

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✅ pranav-new-relic
❌ gffuentes
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