bash: Make interactive the default

The status quo of `bash` not being interactive is frustrating for many users,
because trying to use it interactively is just messed up, and
`bashInteractive` is not intuitive and barely discoverable.

This was brought to my (and many others) attention by @stahnma in his
[talk at CfgMgmtCamp 2025](https://cfp.cfgmgmtcamp.org/ghent2025/talk/YUVUTN/),
where he highlighted this as one of the frustrations he ran into when
learning Nix.

Why this is fine:
- No reason for not making interactive the default was given in the original commit (6c6ff6f36ff26932aa730875bd237c8e37210f0e), but probably it was due to the increase in closure size
- The closure size only increases by 6.9MiB (19.5%) today, with the
  added dependency on the store paths for readline and ncurses, which
  are needed on systems in almost all cases anyways
- If somebody really needs to get a more minimal system, they can use
  the newly-introduced `bashNonInteractive` instead now
- Though to apply it consistently, they'll need to do that in an
  overlay like
  ```
  final: prev: {
    bash = self.bashNonInteractive;
  }
  ```

  Or alternatively using the `system.replaceDependencies.replacements`
  NixOS option approach.

While there's also other such `*Interactive` packages that could use the
same treatment, `bash` is a great start.

This was already attempted before in
https://github.com/NixOS/nixpkgs/pull/151227, but was not continued for
unknown reason.

To avoid stdenv becoming bigger, all uses of bash in the (working)
stdenv's are changed to the explicitly non-interactive version here.

This commit will however still cause a mass rebuild for all packages (and reverse deps)
making use of the default bash.

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