Fix flaky install/uninstall test

[Dean-Coakley]

Proposed changes

• Install/uninstall test now uses a single context
• Fix: Check for nginx install now checks inside container rather than host

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• I have run make install-tools and have attached any dependency changes to this pull request
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• If applicable, I have updated any relevant documentation (README.md)
• If applicable, I have tested my cross-platform changes on Ubuntu 22, Redhat 8, SUSE 15 and FreeBSD 13

Testing

Passed 45 runs in a row on my VM 15 * matrix of rockylinux, almalinux, ubuntu(respectively):

Run 1 times
ok  	github.com/nginx/agent/test/integration/install	101.312s
ok  	github.com/nginx/agent/test/integration/install	94.418s
ok  	github.com/nginx/agent/test/integration/install	22.826s
Run 2 times
ok  	github.com/nginx/agent/test/integration/install	52.023s
ok  	github.com/nginx/agent/test/integration/install	33.253s
ok  	github.com/nginx/agent/test/integration/install	22.226s
Run 3 times
ok  	github.com/nginx/agent/test/integration/install	48.382s
ok  	github.com/nginx/agent/test/integration/install	31.949s
ok  	github.com/nginx/agent/test/integration/install	22.246s
Run 4 times
ok  	github.com/nginx/agent/test/integration/install	52.999s
ok  	github.com/nginx/agent/test/integration/install	36.730s
ok  	github.com/nginx/agent/test/integration/install	22.432s
Run 5 times
ok  	github.com/nginx/agent/test/integration/install	51.788s
ok  	github.com/nginx/agent/test/integration/install	34.334s
ok  	github.com/nginx/agent/test/integration/install	22.083s
Run 6 times
ok  	github.com/nginx/agent/test/integration/install	100.555s
ok  	github.com/nginx/agent/test/integration/install	92.552s
ok  	github.com/nginx/agent/test/integration/install	22.608s
Run 7 times
ok  	github.com/nginx/agent/test/integration/install	57.978s
ok  	github.com/nginx/agent/test/integration/install	35.227s
ok  	github.com/nginx/agent/test/integration/install	22.208s
Run 8 times
ok  	github.com/nginx/agent/test/integration/install	52.876s
ok  	github.com/nginx/agent/test/integration/install	34.402s
ok  	github.com/nginx/agent/test/integration/install	24.797s
Run 9 times
ok  	github.com/nginx/agent/test/integration/install	57.189s
ok  	github.com/nginx/agent/test/integration/install	32.628s
ok  	github.com/nginx/agent/test/integration/install	21.654s
Run 10 times
ok  	github.com/nginx/agent/test/integration/install	49.162s
ok  	github.com/nginx/agent/test/integration/install	36.552s
ok  	github.com/nginx/agent/test/integration/install	21.823s
Run 11 times
ok  	github.com/nginx/agent/test/integration/install	50.825s
ok  	github.com/nginx/agent/test/integration/install	31.728s
ok  	github.com/nginx/agent/test/integration/install	20.233s
Run 12 times
ok  	github.com/nginx/agent/test/integration/install	51.977s
ok  	github.com/nginx/agent/test/integration/install	29.588s
ok  	github.com/nginx/agent/test/integration/install	20.949s
Run 13 times
ok  	github.com/nginx/agent/test/integration/install	43.217s
ok  	github.com/nginx/agent/test/integration/install	29.618s
ok  	github.com/nginx/agent/test/integration/install	21.690s
Run 14 times
ok  	github.com/nginx/agent/test/integration/install	95.431s
ok  	github.com/nginx/agent/test/integration/install	90.997s
ok  	github.com/nginx/agent/test/integration/install	24.131s
Run 15 times
ok  	github.com/nginx/agent/test/integration/install	102.997s
ok  	github.com/nginx/agent/test/integration/install	93.495s
ok  	github.com/nginx/agent/test/integration/install	23.632s

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