Fix esm-view not starting by downgrading esbuild-loader to 2.x.x

[AlbertoBrusa]

• Downgrade esbuild-loader, which fixes starting ESM views in webpack mode. This issue was introduced in Fix esbuild tsconfig bug #2332.
• Adds a new test to verify starting ESM views in webpack mode (previously, only the esbuild variant was covered).

Since upgrading esbuild-loader did not actually fix the issue in #2332, it is a patch change to roll this back. We will separately address the same issue.

[changeset-bot]

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Latest commit: 6f12b3d

The changes in this PR will be included in the next version bump.

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modular-scripts	Patch

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[sgb-io]

_ No description provided. _

Suggested description:

• Downgrade esbuild-loader, which fixes starting ESM views in webpack mode. This issue was introduced in Fix esbuild tsconfig bug #2332.
• Adds a new test to verify starting ESM views in webpack mode (previously, only the esbuild variant was covered).

Since upgrading esbuild-loader did not actually fix the issue in #2332, it is a patch change to roll this back. We will separately address the same issue.