Fix deployment scripts

[daveroga]

• Fix deployment scripts
• Fix README with unified addresses
• Remove unnecessary scripts

[Copilot]

Pull request overview

Updates deployment/testing utilities and project configuration to support newer Polygon ID / iden3 packages and “unified address” deployments across networks.

Changes:

• Refactors request packing / request-id generation flows to use @0xpolygonid/js-sdk helpers and ethers ABI encoding.
• Updates Hardhat network + env configuration and bumps key iden3/Polygon ID dependency versions.
• Refreshes scripts/README to use unified contract addresses and newer request-setting patterns (setRequests).

Reviewed changes

Copilot reviewed 19 out of 20 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
test/utils/utils.ts	Removes local query-hash / verifier-id helpers; adds getChainId() using Hardhat provider.
test/utils/pack-utils.ts	Replaces web3 ABI encoding with ethers AbiCoder for packing validator params/proofs.
scripts/upgradeV3Validator.ts	Updates example validator address and removes unused imports.
scripts/upgradeSigValidator.ts	Updates example validator address and removes unused imports.
scripts/upgradeMTPValidator.ts	Updates example validator address and removes unused imports.
scripts/setRequests-v3validator.ts	Moves to unified addresses + setRequests, uses SDK helpers for request id/hash.
scripts/setRequests-v2validator.ts	Moves to unified addresses + setRequests, uses SDK helpers for request id/hash.
scripts/deployV3Validator.ts	Updates wrapper name and deployProxy initializer args/output.
scripts/deploySigV2Validator.ts	Updates wrapper name and deployProxy initializer args/output.
scripts/deployMTPV2Validator.ts	Updates wrapper name and deployProxy initializer args/output.
scripts/deployIdentityExample.ts	Updates default state address to unified address.
scripts/deployERC20SelectiveDisclosure.ts	Adds verifier lib deployment/linking and setRequests flow with computed requestId.
scripts/deployERC20LinkedUniversalVerifier.ts	Fixes constructor args passed to deployContract.
scripts/deployERC20.ts	Reworks deploy + request creation to support multiple circuit ids and setRequests.
scripts/deployBalanceCredentialIssuer.ts	Updates default state address to unified address.
package.json	Bumps iden3/PolygonID deps; removes Mumbai scripts.
hardhat.config.ts	Renames/adds networks, updates Etherscan config, disables contract sizer on compile.
README.md	Replaces per-network address tables with unified-address docs and notes.
.env.sample	Switches to a single PRIVATE_KEY plus per-network RPC URLs and Etherscan key.

Comments suppressed due to low confidence (3)

README.md:22

• Spelling: “which where deployed” should be “which were deployed”.
  README.md:16
• Markdown formatting: **Universal Verifier V2**** has an extra ** which breaks the bolding and table alignment. Remove the extra asterisks so the label renders correctly.
  README.md:26
• Grammar: “There are a few libraries, which does not tend to evolve much …” is ungrammatical; it should be “which do not tend …” (or rephrase the sentence).

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