Add support for feature pallet_balances/insecure_zero_ed in benchmarks and testing

[manuelmauro]

Description

Add support for feature pallet_balances/insecure_zero_ed in benchmarks and testing.

Integration

In depth notes about how this PR should be integrated by downstream projects. This part is mandatory, and should be
reviewed by reviewers, if the PR does NOT have the R0-Silent label. In case of a R0-Silent, it can be ignored.

Review Notes

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<details>.

Imagine that someone who is depending on the old code wants to integrate your new code and the only information that
they get is this section. It helps to include example usage and default value here, with a diff code-block to show
possibly integration.

Include your leftover TODOs, if any, here.

Checklist

• My PR includes a detailed description as outlined in the "Description" and its two subsections above.
• My PR follows the labeling requirements of this project (at minimum one label for T required)
  • External contributors: ask maintainers to put the right label on your PR.
• I have made corresponding changes to the documentation (if applicable)
• I have added tests that prove my fix is effective or that my feature works (if applicable)

You can remove the "Checklist" section once all have been checked. Thank you for your contribution!

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