refactor: remove useless code and fix a test

[aeddi]

• Commit https://github.com/gnolang/gno/pull/3159/commits/4b6219c5b89aa21a9ae46ee7fede63779194f9f1 move ValidateBlock method from blockExec to state since blockExec.db was an unused parameter. (simplify + remove misleading comment)
• Commit https://github.com/gnolang/gno/pull/3159/commits/4f02bcd90f4ba9625818c43d7d806a43f9dffd62 just removes useless Sprintf found in this package
• Commit https://github.com/gnolang/gno/pull/3159/commits/c34bfd57466d0bf992ac3402865387c89b59393e improves ValidateBasic method (adding one more validation test that was marked with a TODO comment)
• Commit https://github.com/gnolang/gno/pull/3159/commits/df75b32f06d922e85ef493284aa24be0ac4d3524 removes useless case testing the size of a fixed-sized array, see: https://github.com/gnolang/gno/blob/b3800b7dfb864396ac74dc20390e728bc0b2d88e/tm2/pkg/crypto/crypto.go#L24-L30

Contributors' checklist...

- [x] Added new tests, or not needed, or not feasible - [x] Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory - [x] Updated the official documentation or not needed - [x] No breaking changes were made, or a `BREAKING CHANGE: xxx` message was included in the description - [x] Added references to related issues and PRs - [ ] Provided any useful hints for running manual tests

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 41.17647% with 10 lines in your changes missing coverage. Please review.

Project coverage is 63.80%. Comparing base (7188b1c) to head (e5d9431). Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
tm2/pkg/bft/consensus/state.go	14.28%	4 Missing and 2 partials :warning:
tm2/pkg/bft/types/block.go	60.00%	1 Missing and 1 partial :warning:
tm2/pkg/bft/consensus/replay.go	0.00%	1 Missing :warning:
tm2/pkg/bft/state/execution.go	0.00%	0 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #3159 +/- ## ========================================== + Coverage 63.79% 63.80% +0.01% ========================================== Files 549 549 Lines 78833 78824 -9 ========================================== + Hits 50288 50297 +9 + Misses 25153 25138 -15 + Partials 3392 3389 -3 ``` | [Flag](https://app.codecov.io/gh/gnolang/gno/pull/3159/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=gnolang) | Coverage Δ | | |---|---|---| | [contribs/gnodev](https://app.codecov.io/gh/gnolang/gno/pull/3159/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=gnolang) | `61.16% <ø> (ø)` | | | [contribs/gnofaucet](https://app.codecov.io/gh/gnolang/gno/pull/3159/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=gnolang) | `15.77% <ø> (+0.94%)` | :arrow_up: | | [gno.land](https://app.codecov.io/gh/gnolang/gno/pull/3159/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=gnolang) | `73.70% <ø> (ø)` | | | [gnovm](https://app.codecov.io/gh/gnolang/gno/pull/3159/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=gnolang) | `67.94% <ø> (ø)` | | | [misc/genstd](https://app.codecov.io/gh/gnolang/gno/pull/3159/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=gnolang) | `79.72% <ø> (ø)` | | | [tm2](https://app.codecov.io/gh/gnolang/gno/pull/3159/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=gnolang) | `62.44% <41.17%> (+0.03%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=gnolang#carryforward-flags-in-the-pull-request-comment) to find out more.

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