The thread pool provides user data to be stored by (pre-)allocating the
necessary memory. A previous attempt was made to have this user data
aligned on a 32 byte boundary (e.g., to prevent segfault with SIMD
instructions, or avoid inefficient data access); the current
implementation, however, leads to unaligned memory access.

This patch attempts again to implement user data to be 32 byte aligned.
First, use memalign() to allocate the actual job on a 32 byte boundary.
Second, use alignas(32) to align the pointer to the user data to be
aligned to 32 bytes. Since it is the last member of the struct, this
ensures that user data, which is allocated right behind it, will be
aligned to 32 bytes as well.

integration_2023_w31

See merge request oai/openairinterface5g!2282

* !1932 Introduce basic unit testing framework, cleanup
* !2259 NR_UE: improve NFAPI_NR_DMRS_TYPE1_linear_interp()
* !2271 Draft: Make asn1c debug traces functional
* !2274 remove NR UE RRC sub state
* !2278 CI: AW2S - update of AmariUE commands
* !2004 Fix gNB LLR plot view
* !2265 chore(ci): adding back LTE-UE Radio tests
* !2268 fix for PDCCH unscrambling at UE
* !2269 fixes for PUCCH F1 at UE
* !2258 pdcp_config_req_asn1 bug fix
* !2263 UE ServingCellConfigCommon cleanup
* !2275 Fix RRC UE timers based on frames and not slots
* !2280 handle scheduling of DLSCH with DCI10 in common search
* !2277 CI: no Jenkins mail, iperf refactor, add Quectel E1 test
* !2260 Preparation of release v2.0.0

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Merge remote-tracking branch 'origin/NR_MAC_gNB_handle_DLSCH_with_DCI10_common_SS' into integration_2023_w31

- throughput test in DL
- UL throughput: 30s is enough
- increase bidir test time for more reliable measurement
- increase retx thresholds: 1% for first round is too low

The results of individual UEs (e.g., ping) is listed vertically, like
so:

| ping results | UE1 |
|              | UE2 |
|              | UE3 |

Where UE1, UE2, ... represents an entire box with results for UE 1, 2,
... For many UEs, this results in considerable need for vertical space. This
commit changes to something like the following to save space:

| ping results | UE1 UE2 UE3 |

For a single UE, this commit has no major impact (the boxes are not
stretched to width anymore).

A side effect of the previous commit's refactoring is that we mark the
pipeline as failed if a (packet loss/bitrate) threshold is violated.
Previously, the HTML would contain a "Perf not met" hint, but be marked
as successful.

This commit introduces more realistic thresholds for various pipeline
runs. The values are arbitary, following the performances in pipelines
that were marked as successful, but actually had performance problems.
They allow, though, a pipeline to pass following the normal performance
we saw the last weeks.

Jenkins is programmed to send e-mails, but most people don't use it:
- the mail has all results in the attachments, but it is clumsy to
  navigate between mail reader and browser, and CSS is not correct
- there is no link to the actual results
- everybody gets a notification from Gitlab, since we also post it there

Also, everybody who I asked told me they don't like this mail. Let's get
rid of it.

As specified in TS 38.211 Section 7.3.2.3, c_init is the result of a mod
2^31. Before this commit, the code assumed a wrong, implicit mod 2^32,
even though the comment says otherwise.

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>