Use SortedDictionary for consistent order of persisted queries when writing relay format

[DanielZuerrer]

Deterministic order for persisted queries in relay format

• When writing persisted queries in relay format, the use of SortedDictionary ensures deterministic order of queries in the output

Closes #7075

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 77.32%. Comparing base (48de6f2) to head (6c2fd69).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #7078 +/- ## ========================================== + Coverage 73.40% 77.32% +3.91% ========================================== Files 2632 2646 +14 Lines 131361 131997 +636 ========================================== + Hits 96429 102064 +5635 + Misses 34932 29933 -4999 ``` | [Flag](https://app.codecov.io/gh/ChilliCream/graphql-platform/pull/7078/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ChilliCream) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/ChilliCream/graphql-platform/pull/7078/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ChilliCream) | `77.32% <ø> (+3.91%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ChilliCream#carryforward-flags-in-the-pull-request-comment) to find out more.

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