chore: update examples to use ECDSA accounts

[mariodimitrovv]

Description:
Update all tests to use ECDSA accounts instead of ED25519

Fixes #3433

Notes for reviewer:

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[lfdt-bot]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scanner	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues

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[0xivanov]

LGTM