Default ignore health check transactions

[HazAT]

All SDKs, by default, should ignore health check transactions.
Please follow the defaults there: https://docs.sentry.io/product/performance/performance-at-scale/#health-checks

The assumption is, in most cases, you never care about health checks since they don't provide any insight into your users.

We'll going to have Server Side sampling for it see:
getsentry/sentry#49176
getsentry/relay#2118

But since, ideally, we don't even send it to save costs on all sides, let's add this by default to SDKs.

SDKs should just set default value for ignoreTransactions.
It's ok if the user already defined something; it should follow the same logic as the default values we set in ignoreErrors (I am not sure if we merge our defaults with what the user sets)

Tasks

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1. Javascript feat(core): Add default ignoreTransactions for Healthchecks sentry-javascript#8191

[HazAT]

ref:
getsentry/relay#2118
getsentry/sentry#49176