Fix interchain-security tests flakiness

[ljoss17]

Closes: #3519

Description

Bootstrapping provider-consumer chains requires a governance proposal to pass before starting the consumer chain. This PR fixes the flakiness caused by increasing the wait time as it was too close to the voting period. The wait time was previously set to 10s and is now set to 15s.

This PR also adds 2 helper functions to correctly overwrite the config for provier-consumer chains:

• update_genesis_for_consumer_chain sets the voting period to 10s as the bootstrap will wait 15s
• update_relayer_config_for_consumer_chain will set ccv_consumer_chain = true for any chains with id ibcconsumer and set the trusting_period = 99 as it needs to be lower than the unbonding_period set in the governance proposal which is 100s.

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PR author checklist:

• Added changelog entry, using unclog.
• Added tests: integration (for Hermes) or unit/mock tests (for modules).
• Linked to GitHub issue.
• Updated code comments and documentation (e.g., docs/).
• Tagged one reviewer who will be the one responsible for shepherding this PR.

Reviewer checklist:

• Reviewed Files changed in the GitHub PR explorer.
• Manually tested (in case integration/unit/mock tests are absent).

[romac]

Excellent!