fix(server): chained .pipe() in observables

[KATT]

Closes #

🎯 Changes

I haven't had to touch the observables in years as our use-cases are quite limited, but I noticed the other day that .pipe().pipe() was broken when working on #5498.

This fixes that... and now the operators look a bit more like the RxJs ones (e.g. https://github.com/ReactiveX/rxjs/blob/master/packages/rxjs/src/internal/operators/tap.ts)

✅ Checklist

• I have followed the steps listed in the Contributing guide.
• If necessary, I have added documentation related to the changes made.
• I have added or updated the tests related to the changes made.

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[github-actions]

Diagnostics Comparison

Numbers

Metric	PR	next
Files	774	774 (➖ 0)
Lines of Library	40,241	40,241 (➖ 0)
Lines of Definitions	117,161	117,161 (➖ 0)
Lines of TypeScript	4,967	4,967 (➖ 0)
Lines of JavaScript	0	0 (➖ 0)
Lines of JSON	0	0 (➖ 0)
Lines of Other	0	0 (➖ 0)
Identifiers	173,320	173,320 (➖ 0)
Symbols	107,712	107,712 (➖ 0)
Types	89	89 (➖ 0)
Instantiations	0	0 (➖ 0)
Memory used	168,356	168,173 (🔺 183)
Assignability cache size	0	0 (➖ 0)
Identity cache size	0	0 (➖ 0)
Subtype cache size	0	0 (➖ 0)
Strict subtype cache size	0	0 (➖ 0)

Timings and averages

Metric	PR	next
max (s)	4.189	4.211 (🔽🟢 -0.02)
min (s)	4.189	4.211 (🔽🟢 -0.02)
avg (s)	4.189	4.211 (🔽🟢 -0.02)
median (s)	4.189	4.211 (🔽🟢 -0.02)
length	1	1 (➖ 0)

unstable timings

Unstable

Timings are not reliable in here

Metric	PR	next
I/O Read time	0.05	0.04 (🔺 0.01)
Parse time	0.71	0.7 (🔺 0.01)
ResolveTypeReference time	0.03	0.03 (➖ 0)
ResolveModule time	0.1	0.11 (🔽🟢 -0.01)
ResolveLibrary time	0.02	0.02 (➖ 0)
Program time	1.04	1.03 (🔺 0.01)
Bind time	0.42	0.4 (🔺 0.02)
Total time	1.46	1.43 (🔺 0.03)

[github-actions]

This pull request has been locked because we are very unlikely to see comments on closed issues. If you think, this PR is still necessary, create a new one with the same branch. Thank you.