Add Bootsnap gem to speed up app boot time

[Gerg]

• Also marginally speeds up tests

Related to #4800 and #4802

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Link to gem: https://github.com/rails/bootsnap

Without Bootsnap:

❯ time ./bin/cloud_controller
ruby 3.2.10 (2026-01-14 revision a3a6d25788) [arm64-darwin25]
Usage: cloud_controller [options]
    -c, --config [ARG]               Configuration File
    -s, --secrets [ARG]              Secrets File
./bin/cloud_controller  1.31s user 0.78s system 61% cpu 3.388 total

❯ NO_DB_MIGRATION=1 multitime -n 10 bundle exec rspec spec/unit/actions/app_create_spec.rb
 
 ...

===> multitime results
1: bundle exec rspec spec/unit/actions/app_create_spec.rb
            Mean        Std.Dev.    Min         Median      Max
real        8.162       0.341       7.728       8.190       8.911
user        2.872       0.052       2.790       2.869       2.968
sys         1.503       0.049       1.426       1.502       1.591

With Bootsnap:

❯ time ./bin/cloud_controller
ruby 3.2.10 (2026-01-14 revision a3a6d25788) [arm64-darwin25]
Usage: cloud_controller [options]
    -c, --config [ARG]               Configuration File
    -s, --secrets [ARG]              Secrets File
./bin/cloud_controller  0.74s user 0.56s system 65% cpu 1.983 total

❯ NO_DB_MIGRATION=1 multitime -n 10 bundle exec rspec spec/unit/actions/app_create_spec.rb

...

===> multitime results
1: bundle exec rspec spec/unit/actions/app_create_spec.rb
            Mean        Std.Dev.    Min         Median      Max
real        5.951       0.250       5.460       5.944       6.435
user        2.208       0.056       2.142       2.197       2.329
sys         0.950       0.046       0.890       0.938       1.036

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