fix: avoid unresolved import warning on stencil apps (#27765)

Issue number: resolves #27762

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## What is the current behavior?
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Stencil 3.4.1 regressed the tsconfig alias path transpilation. This is
fixed in 4.0.0 though.

## What is the new behavior?
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this PR. -->

- Downgrade to Stencil 3.4.0. Stencil 4.0 has breaking changes, so I'd
like to wait on upgrading until we can work through any of the changes
that impact Ionic.

This reverts commit 9793b3c0a0828b938b825116f78f616b1550d623.


## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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and migration path for existing applications below. -->


## Other information

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screenshots of how the component looks before and after the change. -->

Stencil issue: https://github.com/ionic-team/stencil/issues/4550