feat: use alchemy provider, light account for e2e tests

[denniswon]

We should use AlchemyProvider with gas manager for all our e2e tests to less make it flaky.
Also, use light accounts unless for simple account tests.

For Kernel, just utilizing fee data getter override to set test passing variables.

---

PR-Codex overview

Detailed summary

• Added @alchemy/aa-alchemy as a devDependency in packages/accounts/package.json.
• Updated constants.ts files in various packages to include new environment variables and remove unnecessary ones.
• Updated base.ts in packages/core/src/provider to use const instead of let for maxPriorityFeePerGasBid.
• Updated imports and network configurations in various test files to use sepolia chain instead of polygonMumbai.
• Updated withFeeDataGetter.md in site/packages/aa-core/provider to use new fee values.
• Updated imports and network configurations in simple-account.test.ts files to use sepolia chain instead of polygonMumbai.
• Updated imports and network configurations in kernel-account.test.ts file to use MUMBAI_RPC_URL instead of RPC_URL.
• Updated imports and network configurations in simple-account.test.ts file to use MUMBAI_RPC_URL instead of RPC_URL.
• Updated imports and network configurations in light-account.test.ts file to use AlchemyProvider from @alchemy/aa-alchemy and LightSmartContractAccount from ../../index.js.

The following files were skipped due to too many changes: packages/accounts/src/light-account/e2e-tests/light-account.test.ts

✨ Ask PR-Codex anything about this PR by commenting with /codex {your question}

[moldy530]

Are all the changes in this PR relevant? Seems like it includes way more than e2e updates?

[avasisht23]

sorry @denniswon I just rebased dev on main after pulling in the changes for a new version.

make sure to rebase this PR on dev again

[avasisht23]

lgtm, few nits