Rust 2024 let-chains to simplify wait Conditions

[clux]

started out as a PR to try out let-chains, but found that it solves most of the the ergonomic problem with the wait API that I tried to solve earlier in #1498

it's not quite as elegant as #1498, but it also doesn't come with any of the problems and is non-breaking.

Unfortunately it does require rust2024 on rustfmt which means it does require a lot of incidental changes.

The first commit is the human generated part, the second is from cargo fmt (third to get CI to accept it).

---

It's a little early for this because it requires Rust 1.88 (current latest), and we should wait a version or two before making a requirement.

But if the general setup (outlined in the first commit) is acceptable, I'll rebase at 1.90.

[codecov]

Codecov Report

Attention: Patch coverage is 84.00000% with 8 lines in your changes missing coverage. Please review.

Project coverage is 75.1%. Comparing base (6590ea9) to head (d9571ab).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
kube-client/src/client/auth/mod.rs	16.7%	5 Missing ⚠️
kube-core/src/schema.rs	0.0%	1 Missing ⚠️
kube-derive/src/custom_resource.rs	0.0%	1 Missing ⚠️
kube-derive/src/resource.rs	0.0%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #1792     +/-   ##
=======================================
- Coverage   75.2%   75.1%   -0.0%     
=======================================
  Files         84      84             
  Lines       7791    7791             
=======================================
- Hits        5853    5850      -3     
- Misses      1938    1941      +3     

Files with missing lines	Coverage Δ
kube-client/src/api/core_methods.rs	72.4% <ø> (ø)
kube-client/src/api/entry.rs	77.1% <ø> (ø)
kube-client/src/api/mod.rs	65.4% <ø> (ø)
kube-client/src/api/portforward.rs	0.0% <ø> (ø)
kube-client/src/api/remote_command.rs	42.1% <ø> (ø)
kube-client/src/api/subresource.rs	51.8% <ø> (ø)
kube-client/src/api/util/csr.rs	66.7% <ø> (ø)
kube-client/src/api/util/mod.rs	93.2% <ø> (ø)
kube-client/src/client/auth/oauth.rs	0.0% <ø> (ø)
kube-client/src/client/auth/oidc.rs	56.4% <ø> (ø)
... and 52 more

... and 1 file with indirect coverage changes

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