fix: resolve the errors in ```GetLightClientUpdatesByRange``` function

[rupam-04]

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What type of PR is this?

Bug fix

What does this PR do? Why is it needed?

1. Remove this line
2. Return HandleError in places where continue is used inside if err != nil
3. Make this requirement 1 vote and not 66%

Which issues(s) does this PR fix?

Fixes #14170

Other notes for review

I am yet to add unit tests for the 3rd change

[CLAassistant]

All committers have signed the CLA.

[rupam-04]

Let's not merge without tests to make sure we don't forget about them

tests added! Pls let me know if any more changes are required