fix: restore the all_or_nothing witness/constant for ec-add

[guipublic]

Description

Problem*

Ec addition does not allow constant and non-constant mix for their inputs.

Summary*

Revert the changes from #8552 which mix constant and non constant inputs for ec-add

Additional Context

This is due to this issue: AztecProtocol/barretenberg#1108
We should investigate if this impact also the ec-add-unsafe and see if there is a workaround if this is the case..

Documentation*

Check one:

• No documentation needed.
• Documentation included in this PR.
• [For Experimental Features] Documentation to be submitted in a separate PR.

PR Checklist*

• I have tested the changes locally.
• I have formatted the changes with Prettier and/or cargo fmt on default settings.

[github-actions]

Changes to circuit sizes

Generated at commit: 4e2b7cdf4015b59980e6b546c4ff73299d37673d, compared to commit: b2bfdb7bb0fc661bfb27da365f108cf131771295

🧾 Summary (10% most significant diffs)

Program	ACIR opcodes (+/-)	%	Circuit size (+/-)	%
regression_7744	+1 ❌	+14.29%	+16 ❌	+38.10%
regression_5045	+1 ❌	+10.00%	+16 ❌	+1.33%

---

Full diff report 👇

Program	ACIR opcodes (+/-)	%	Circuit size (+/-)	%
regression_7744	8 (+1)	+14.29%	58 (+16)	+38.10%
regression_5045	11 (+1)	+10.00%	1,215 (+16)	+1.33%
embedded_curve_ops	14 (+1)	+7.69%	5,971 (+16)	+0.27%

[github-actions]

⚠️ Performance Alert ⚠️

Possible performance regression was detected for benchmark 'Test Suite Duration'.
Benchmark result of this commit is worse than the previous benchmark result exceeding threshold 1.20.

Benchmark suite	Current: 96c7388	Previous: b2bfdb7	Ratio
test_report_AztecProtocol_aztec-packages_noir-projects_noir-protocol-circuits_crates_blob	3 s	2 s	1.50
test_report_AztecProtocol_aztec-packages_noir-projects_noir-protocol-circuits_crates_private-kernel-lib	2 s	1 s	2

This comment was automatically generated by workflow using github-action-benchmark.

CC: @TomAFrench