[chain-pr 11/12] Update sandbox, dev tooling, scripts, and developer-extension for v7

[johnHackworth]

This PR is part of a chain split from #0 v7 by chain-pr.

Changes

Add crossorigin to sandbox script tags, rename profiler/recorder chunk names → datadogProfiler/datadogRecorder in deploy scripts, decouple browserSdkVersion from releaseVersion, update content-script SDK loader for ESM dynamic imports, switch developer-extension sampler import to core, fix bundle size grouping, support next-major canary version variants in deploy.

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Draft — pending author review. Merge in order unless marked parallel.

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