CADC-12637 - make contentType definition more flexible for text/plain.

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (5735d35) 93.18% compared to head (4be9574) 93.19%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #169 +/- ## ======================================= Coverage 93.18% 93.19% ======================================= Files 23 23 Lines 8546 8547 +1 ======================================= + Hits 7964 7965 +1 Misses 582 582 ``` | [Impacted Files](https://app.codecov.io/gh/opencadc/caom2tools/pull/169?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opencadc) | Coverage Δ | | |---|---|---| | [caom2utils/caom2utils/caom2blueprint.py](https://app.codecov.io/gh/opencadc/caom2tools/pull/169?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opencadc#diff-Y2FvbTJ1dGlscy9jYW9tMnV0aWxzL2Nhb20yYmx1ZXByaW50LnB5) | `89.96% <100.00%> (ø)` | | | [caom2utils/caom2utils/data\_util.py](https://app.codecov.io/gh/opencadc/caom2tools/pull/169?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opencadc#diff-Y2FvbTJ1dGlscy9jYW9tMnV0aWxzL2RhdGFfdXRpbC5weQ==) | `99.44% <100.00%> (+<0.01%)` | :arrow_up: |

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