Account for bools in archive_less_mature

[Ariana-B]

Reason for this pull request

Datacube-core has updated to have archive_less_mature provided as an optional integer, with archive_less_mature logic skipped if the value is None. But some other scripts have not yet been updated, such as the odc-tools *-to-dc commands, causing errors such as this one: https://app.slack.com/client/T0L4V0TFT/C0L4WHVME/thread/C0L4WHVME-1696543022.226709

Proposed changes

• Account for archive_less_mature being provided as a bool by setting it to 500ms (default) if True and returning if False so that it doesn't search for or archive less mature datasets

  • [ ] Closes #xxxx
  • [x] Tests added / passed
  • [x] Fully documented, including docs/about/whats_new.rst for all changes

---

:books: Documentation preview :books:: https://datacube-core--1498.org.readthedocs.build/en/1498/

[codecov[bot]]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (1ac445c) 91.78% compared to head (379b2a7) 91.75%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #1498 +/- ## =========================================== - Coverage 91.78% 91.75% -0.03% =========================================== Files 132 132 Lines 14539 14549 +10 =========================================== + Hits 13345 13350 +5 - Misses 1194 1199 +5 ``` | [Files](https://app.codecov.io/gh/opendatacube/datacube-core/pull/1498?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opendatacube) | Coverage Δ | | |---|---|---| | [datacube/index/abstract.py](https://app.codecov.io/gh/opendatacube/datacube-core/pull/1498?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opendatacube#diff-ZGF0YWN1YmUvaW5kZXgvYWJzdHJhY3QucHk=) | `87.84% <64.28%> (-0.59%)` | :arrow_down: |

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