fix(platform-wallet): spv error propagation

[ZocoLini]

Because start was being called inside the run method, and spawn in background was calling this run method without returning any start error, the spv client could fail to start and nobody was reciting the error. With this PR I force the start method to be called independently, this way start errors are no longer discarded.

Based on PR #3811

Regression tests in PR #3712

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• I have made corresponding changes to the documentation if needed

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