Fix tests race condition and improve gas multiplier for tests

[dzmitryhil]

Description

Fix tests race condition and improve gas multiplier for tests

Reviewers checklist:

• Try to write more meaningful comments with clear actions to be taken.
• Nit-picking should be unblocking. Focus on core issues.

Authors checklist

• Provide a concise and meaningful description
• Review the code yourself first, before making the PR.
• Annotate your PR in places that require explanation.
• Think and try to split the PR to smaller PR if it is big.

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This change is 

[miladz68]

Reviewed 4 of 4 files at r1, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @dzmitryhil, @masihyeganeh, @wojtek-coreum, and @ysv)

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relayer/runner/config_test.go line 64 at r1 (raw file):

		tc := tc
		t.Run(tc.name, func(tt *testing.T) {
			// not parallel intentionally top prevent race

typo "top"

[wojtek-coreum]

Reviewed 4 of 4 files at r1, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @dzmitryhil, @masihyeganeh, and @ysv)