…tach sonic-net#5

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#### Description
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Two changes are being done in this PR:
Remove deletion of the `PCIE_DETACH_INFO` from the pcied (This should be handled by the power off/power on of the DPU from the module_base implementation)
The returned value from `self.detach_info.get(key)` in pcied is of the form tuple:
`(True, [('bus_info', '0000:03:00.1'), ('dpu_state', 'detaching')])` This has to be handled correctly by the pcied (which was expecting a dictionary

#### Motivation and Context
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     Why is this change required? What problem does it solve?
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This is required since the pcied should not delete the entries from the `PCIE_DETACH_INFO` table as opposed to the module_base implementation

#### How Has This Been Tested?
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Unit tests:
```
tests/test_DaemonPcied.py::TestDaemonPcied::test_signal_handler PASSED   [  7%]
tests/test_DaemonPcied.py::TestDaemonPcied::test_run PASSED              [ 14%]
tests/test_DaemonPcied.py::TestDaemonPcied::test_del PASSED              [ 21%]
tests/test_DaemonPcied.py::TestDaemonPcied::test_del_exception PASSED    [ 28%]
tests/test_DaemonPcied.py::TestDaemonPcied::test_is_dpu_in_detaching_mode PASSED [ 35%]
tests/test_DaemonPcied.py::TestDaemonPcied::test_check_pcie_devices PASSED [ 42%]
tests/test_DaemonPcied.py::TestDaemonPcied::test_check_pcie_devices_update_aer PASSED [ 50%]
tests/test_DaemonPcied.py::TestDaemonPcied::test_check_pcie_devices_detaching PASSED [ 57%]
tests/test_DaemonPcied.py::TestDaemonPcied::test_update_pcie_devices_status_db PASSED [ 64%]
tests/test_DaemonPcied.py::TestDaemonPcied::test_check_n_update_pcie_aer_stats PASSED [ 71%]
tests/test_DaemonPcied.py::TestDaemonPcied::test_update_aer_to_statedb PASSED [ 78%]
tests/test_pcied.py::test_main PASSED                                    [ 85%]
tests/test_pcied.py::test_read_id_file PASSED                            [ 92%]
tests/test_pcied.py::test_load_platform_pcieutil PASSED                  [100%]
```
Also tested manually on smart switch system,
Restarted pcied (`supervisorctl restart pcied` in pmon docker) and checked that the detach info table is not deleted)
Checked the logs to confirm that pcied is not crashing due to the additional change for processing of detach table
#### Additional Information (Optional)