Nix Release 2.24.0: Further Enhancements and Build System Migration

### Other changes - Solve `cached failure of attribute X` [#9165](https://github.com/NixOS/nix/issues/9165) [#10513](https://github.com/NixOS/nix/issues/10513) [#10564](https://github.com/NixOS/nix/pull/10564) This eliminates all "cached failure of attribute X" messages by forcing evaluation of the original value when needed to show the exception to the user. This enhancement improves error reporting by providing the underlying message and stack trace. Author: [**Eelco Dolstra (@edolstra)**](https://github.com/edolstra) - Run the flake regressions test suite [#10603](https://github.com/NixOS/nix/pull/10603) This update introduces a GitHub action to run a subset of the [flake regressions test suite](https://github.com/NixOS/flake-regressions), which includes 259 flakes with their expected evaluation results. Currently, the action runs the first 25 flakes due to the full test suite's extensive runtime. A manually triggered action may be implemented later to run the entire test suite. Author: [**Eelco Dolstra (@edolstra)**](https://github.com/edolstra) - Support unit prefixes in configuration settings [#10668](https://github.com/NixOS/nix/pull/10668) Configuration settings in Nix now support unit prefixes, allowing for more intuitive and readable configurations. For example, you can now specify [`--min-free 1G`](@docroot@/command-ref/opt-common.md#opt-min-free) to set the minimum free space to 1 gigabyte. This enhancement was extracted from [#7851](https://github.com/NixOS/nix/pull/7851) and is also useful for PR [#10661](https://github.com/NixOS/nix/pull/10661). Author: [**Eelco Dolstra (@edolstra)**](https://github.com/edolstra) - `nix build`: show all FOD errors with `--keep-going` [#10734](https://github.com/NixOS/nix/pull/10734) The [`nix build`](@docroot@/command-ref/new-cli/nix3-build.md) command has been updated to improve the behavior of the [`--keep-going`] flag. Now, when `--keep-going` is used, all hash-mismatch errors of failing fixed-output derivations (FODs) are displayed, similar to the behavior for other build failures. This enhancement ensures that all relevant build errors are shown, making it easier for users to update multiple derivations at once or to diagnose and fix issues. Author: [**Jörg Thalheim (@Mic92)**](https://github.com/Mic92), [**Maximilian Bosch (@Ma27)**](https://github.com/Ma27) [`--keep-going`](@docroot@/command-ref/opt-common.md#opt-keep-going) - Build with Meson [#2503](https://github.com/NixOS/nix/issues/2503) [#10378](https://github.com/NixOS/nix/pull/10378) [#10855](https://github.com/NixOS/nix/pull/10855) [#10904](https://github.com/NixOS/nix/pull/10904) [#10908](https://github.com/NixOS/nix/pull/10908) [#10914](https://github.com/NixOS/nix/pull/10914) [#10933](https://github.com/NixOS/nix/pull/10933) [#10936](https://github.com/NixOS/nix/pull/10936) [#10954](https://github.com/NixOS/nix/pull/10954) [#10955](https://github.com/NixOS/nix/pull/10955) [#10963](https://github.com/NixOS/nix/pull/10963) [#10967](https://github.com/NixOS/nix/pull/10967) [#10973](https://github.com/NixOS/nix/pull/10973) [#11034](https://github.com/NixOS/nix/pull/11034) [#11054](https://github.com/NixOS/nix/pull/11054) [#11055](https://github.com/NixOS/nix/pull/11055) [#11060](https://github.com/NixOS/nix/pull/11060) [#11064](https://github.com/NixOS/nix/pull/11064) [#11155](https://github.com/NixOS/nix/pull/11155) These changes aim to replace the use of autotools and `make` with Meson for building various components of Nix. Additionally, each library is built in its own derivation, leveraging Meson's "subprojects" feature to allow a single development shell for building all libraries while also supporting separate builds. This approach aims to improve productivity and build modularity, compared to both make and a monolithic Meson-based derivation. Special thanks to everyone who has contributed to the Meson port, particularly [**@p01arst0rm**](https://github.com/p01arst0rm) and [**@Qyriad**](https://github.com/Qyriad).

This section details further changes in Nix release 2.24.0, including the elimination of 'cached failure of attribute X' messages, the addition of a GitHub action for flake regression tests, support for unit prefixes in configuration settings, improved `--keep-going` behavior in `nix build` to display all FOD errors, and a significant effort to migrate the build system to Meson, enhancing modularity and developer productivity.