[api] fix estimateGas for migrateStake

[envestcc]

Description

When estimating the gas for the MigrateStake transaction, the amount of the native bucket is not returned to the sender. If the sender's balance is insufficient for the bucket amount, an insufficient balance for transfer error will be returned.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• [] make test
• [] fullsync
• [] Other test (please specify)

Test Configuration:

• Firmware version:
• Hardware:
• Toolchain:
• SDK:

Checklist:

• [] My code follows the style guidelines of this project
• [] I have performed a self-review of my code
• [] I have commented my code, particularly in hard-to-understand areas
• [] I have made corresponding changes to the documentation
• [] My changes generate no new warnings
• [] I have added tests that prove my fix is effective or that my feature works
• [] New and existing unit tests pass locally with my changes
• [] Any dependent changes have been merged and published in downstream modules

[dustinxie]

can we do this by adding a new ConstructExecutionForSimulation?

func ConstructExecutionForSimulation() {
	ConstructExecution()
	// add amount to the sender account
	sender, err := accountutil.LoadAccount(sm, caller)
	if err != nil {
		return err
	}
	if err = sender.AddBalance(exec.Amount()); err != nil {
		return err
	}
	return accountutil.StoreAccount(sm, caller, sender)
}

this way we can avoid adding SimulationConfig, which works but like an overkill

[envestcc]

already discussed offline

[sonarcloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud