[AGIPD][CORRECT] Use calcat_interface and remove precorrection notebook

Description

Updating AGIPD correction notebooks for using calcat_interface and avoiding calibrationDBRemote and cal_db_interactive

Note: This MR is based on https://git.xfel.eu/detectors/pycalibration/-/merge_requests/773

Related to https://git.xfel.eu/calibration/planning/-/issues/150 and https://git.xfel.eu/calibration/planning/-/issues/168

1. Remove notebooks/AGIPD/AGIPD_Retrieve_Constants_Precorrection.ipynb
2. Remove cal_tools/agipdlib functions for loading constants from YAML or DB. Also, remove related tests.
3. Move to retrieve and initialize constants to the AGIPD correction notebook.
4. Use a new feature for displaying the markdown table for retrieved constants.
5. Fix a bug when displaying one retrieved constant in CalibrationData metadata object.
6. Use a fragment file to store retrieved constants.
7. Clean-ups around related code.

How Has This Been Tested?

• Testing..

Relevant Documents (optional)

Types of changes

• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)

Checklist:

Reviewers

@schmidtp @kluyvert

notebooks/LPD/LPD_retrieve_constants_precorrection.ipynb

@@ -188,9 +188,9 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3.8.11 ('.cal4_venv')",
+   "display_name": "cal4_venv",
    "language": "python",
-   "name": "python3"
+   "name": "cal4_venv"
   },
   "language_info": {
    "codemirror_mode": {
@@ -202,7 +202,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.8.11"
+   "version": "3.8.11 (default, Jul  2 2021, 14:23:46) \n[GCC 4.8.5 20150623 (Red Hat 4.8.5-44)]"
   },
   "orig_nbformat": 4,
   "vscode": {